2026

• Westendorp, Josien; Jalloh, Rugiatu; Sheriff, Sarrah; Wussow, Jenny; Stamland, Guro; Bjorøy, Sigrid Anne; Moses, Francis; Rijken, Marcus J.; Hoffmann-Lonnee, Risa; Bolkan, Håkon Angell. (2026) A cross-sectional study of caesarean deliveries performed by medical doctors and associate clinicians in nine district and regional hospitals in Sierra Leone using the Robson Ten Group Classification System. International Journal of Gynecology & Obstetrics
  Academic article
• Mona, Johanna; Ahlbäck, Johan G.; Lebbie, Aiah; Ashley, Thomas; Bolkan, Håkon Angell; van Duinen, Aalke Johan. (2026) Challenges and enablers in accessing paediatric inguinal hernia surgical care in Sierra Leone: a qualitative exploratory study. BMJ Open
  Academic article
• Øvreås, Elisabeth; Vreede, Eric; van Duinen, Alex J; Svengaard, Maria; Furre, Mali Eggen; Kamara, Augustine Kamanda; Sesay, Denis Akar; Lonnee, Herman; Nathani, Priyansh; Kabba, Mustapha S. (2026) Anaesthesia workforce distribution, practices and essential resources in Sierra Leone: a nationwide, cross-sectional, facility-based study. BMJ Open
  Academic article
• Faradonbeh, Sara Aakre; Halvorsen, Anniken Høeg; Ashley, Thomas; Lebbie, Aiah; Kabba, Mustapha S; Andersen, Lena; Bolkan, Håkon Angell; van Duinen, Alex J. (2026) Development of paediatric surgical care in Sierra Leone: a repeated nationwide cross-sectional study from 2012 to 2023. BMJ Public Health
  Academic article

2025

• Martens, Janine P. J.; Leerdam, Daniel van; Kanneh, Sayoh; Smalle, Isaac O.; Sankoh, Osman; van Duinen, Alex J.; Bolkan, Håkon Angell. (2025) Surgical Volume in Sierra Leone: A Comparison Between Population and Facility‐Based Data Collection. World Journal of Surgery
  Academic article
• Ashley, Thomas; Ashley, Hannah F; Wladis, Andreas; Nordin, Pär; Ohene-Yeboah, Michael; Smalle, Isaac O; Beard, Jessica H; Löfgren, Jenny; Bolkan, Håkon Angell; van Duinen, Alex J. (2025) Outcomes after elective inguinal hernia repair with mesh performed by associate clinicians versus medical doctors in Sierra Leone: 5-year follow-up of a randomized clinical trial. British Journal of Surgery
  Academic article
• Bakker, Juul Marlies; van Duinen, Aalke Johan; Patil, Priti; Nathani, Priyansh; Gyedu, Adam; Adde, Håvard Askim; Bhushan, Pranav; Roy, Nobhojit; Gadgil, Anita; Bolkan, Håkon Angell. (2025) Exploring the concept of surgical transition: surgical activity in the light of economic development in Sierra Leone, Liberia, Ghana and India. Frontiers in Surgery
  Academic article
• Nunes, Jonathan H. Vas; van Duinen, Aalke Johan; Boateng, Daniel; Tommy, Amidu J; Sankoh, Osman; Grobusch, Martin P.; Bolkan, Håkon Angell. (2025) Incidence and prevalence of traumatic and non-traumatic wounds and burns and access to wound care in Sierra Leone; data from a nationwide household survey (PRESSCO) 2020. Heliyon
  Academic article
• Furre, Mali Eggen; Svengaard, Maria; Øvreås, Elisabeth; van Duinen, Aalke Johan; Ashley, Thomas; Grobusch, Martin P.; Bakker, Juul Marlies; Gunneweg, Jaap; Roy, Nobhojit; Kabba, Mustapha S.. (2025) The impact of surgical task-sharing in Sierra Leone: a nationwide longitudinal observational study on surgical workforce and volume, 2012–2023. BMJ Global Health
  Academic article
• Dawkins, Bryony; Shinkins, Bethany; Ensor, Tim; Jayne, David; Ashley, Thomas; van Duinen, Aalke Johan; Bolkan, Håkon Angell; Meads, David. (2025) Evaluating Access Improving Interventions: An Economic Evaluation of Surgical Task-Shifting for C-Sections in Sierra Leone. Applied Health Economics and Health Policy
  Academic article
• Dutta, Rohini; Nathani, Priyansh; Patil, Priti; Ghoshal, Rakhi; Tuli, Shagun; Bakker, Juul Marlies; van Duinen, Aalke Johan; Roy, Nobhojit; Boatin, Adeline A.; Gadgil, Anita. (2025) State-wise variation and inequalities in caesarean delivery rates in India: analysis of the National Family Health Survey-5 (2019–2021) data. The Lancet Regional Health – Southeast Asia
  Academic article

2024

• Kesteren, Jurre van; van Duinen, Aalke Johan; Bonjer, Jaap H.. (2024) Laparoscopy training from global surgery perspective.
  Non-fiction chapter
• Werz, Markus Jan; van Duinen, Aalke Johan; Hampaye, Theophilus C.; Broek, Ankie van den; Bolkan, Håkon Angell. (2024) Exploring barriers and enabling factors for surgical task sharing with physician assistants in Liberia: a qualitative pre-implementation study. BMJ Open
  Academic article
• Patil, Priti; Nathani, Priyansh; Bakker, Juul Marlies; van Duinen, Aalke Johan; Bhushan, Pranav; Shukla, Minal; Chalise, Samir; Roy, Nobhojit; Gadgil, Anita. (2024) Authors' reply: Are low- and middle-income countries achieving the Lancet commission global benchmark for surgical volumes? A systematic review. World Journal of Surgery
  Commentary
• Lwin, Zin Min Thet; Mansaray, Abdul Rahman; Al-Samman, Sam; Keel, George; Forsberg, Birger C.; Beard, Jessica H.; van Duinen, Aalke Johan; Bolkan, Håkon Angell; Ashley, Thomas; Palmu, Juuli. (2024) Economic evaluation of expanding inguinal hernia repair among adult males in Sierra Leone. PLOS Global Public Health
  Academic article
• Logstein, Erika; Torp, Richard Hald; Ashley, Thomas; Kamara, Michael M.; Koroma, Alimamy P.; Dumbuya, Abu Bakarr; Suma, Musa S.; Moijue, Abdul Rahman; Westendorp, Josien; Kujabi, Monica L.. (2024) Long-term maternal outcomes 5 years after cesarean section in Sierra Leone: A prospective cohort study. International Journal of Gynecology & Obstetrics
  Academic article
• Adde, Håvard Askim; Oghogho, Mark Deenize; van Duinen, Aalke Johan; Grimes, Caris E; Hampaye, Theophilus C; Quaife, Matthew; Bolkan, Håkon Angell. (2024) The economic burden associated with unmet surgical needs in Liberia: A retrospective macroeconomic analysis based on a nationwide enumeration of surgical procedures. BMJ Open
  Academic article

2023

• Ashley, Thomas; Ashley, Hannah F.; Wladis, Andreas; Nordin, Pär; Ohene-Yeboah, Michael; Rukas, Rimantas; Lipnickas, Vytautas; Smalle, Isaac O.; Holm, Kristina; Kalsi, Herta. (2023) Standardised Competency-Based Training of Medical Doctors and Associate Clinicians in Inguinal Repair with Mesh in Sierra Leone. World Journal of Surgery
  Academic article
• Wangen, Endre; Gillund, Even Westgaard; Reinholdtsen, Eirik Midtgaard; Henriksveen, Kristian Jostad; van Duinen, Aalke Johan; Faqiri, Mirwais; Ystgaard, Brynjulf; Bolkan, Håkon Angell. (2023) Akutte laparotomier ved St. Olavs hospital. Tidsskrift for Den norske legeforening (Tidsskriftet)
  Academic article
• Dutta, Rohini; Tuli, Shagun; Shukla, Minal; Patil, Priti; van Duinen, Aalke Johan; Thivalapill, Neil; Ghoshal, Rakhi; Jayaram, Anusha; Roy, Nobhojit; Gadgil, Anita. (2023) Geographic and socioeconomic inequities in cesarean delivery rates at the district level in Madhya Pradesh, India: A secondary analysis of the national family health survey-5. Global health action
  Academic article
• Lindenbergh, Karel C.; van Duinen, Aalke Johan; Ahlback, Johan Gottfrid; Kamoh, Joseph; Bah, Silleh; Ashley, Thomas; Löfgren, Jenny; Grobusch, Martin P.; Sankoh, Osman; Bolkan, Håkon Angell. (2023) Prevalence, incidence, repair rate, and morbidity of groin hernias in Sierra Leone: cross-sectional household study. BJS Open
  Academic article
• van Duinen, Aalke Johan; Gyedu, Adam. (2023) Task Shifting and Task Sharing to Strengthen the Surgical Workforce in Sub-Saharan Africa: A Systematic Review of the Existing Literature. World Journal of Surgery
  Academic article
• Patil, Priti; Nathani, Priyansh; Bakker, Juul Marlies; van Duinen, Aalke Johan; Bhushan, Pranav; Shukla, Minal; Chalise, Samir; Roy, Nobhojit; Gadgil, Anita. (2023) Authors’ Reply: Are LMICs Achieving the Lancet Commission Global Benchmark for Surgical Volumes? A Systematic Review. World Journal of Surgery
  Commentary
• Patil, Priti; Nathani, Priyansh; Bakker, Juul Marlies; van Duinen, Aalke Johan; Bhushan, Pranav; Shukla, Minal; Chalise, Samir; Roy, Nobhojit; Gadgil, Anita. (2023) Are LMICs Achieving the Lancet Commission Global Benchmark for Surgical Volumes? A Systematic Review. World Journal of Surgery
  Academic literature review

2022

• Shukla, Minal; Mohan, Monali; van Duinen, Aalke Johan; Gadgil, Anita; Bakker, Juul Marlies; Bhushan, Pranav; Roy, Nobhojit. (2022) Assessing geographical and economic inequalities in caesarean section rates between the districts of Bihar, India: a secondary analysis of the National Family Health Survey. BMJ Open
  Academic article
• Kesteren, Jurre van; van Duinen, Aalke Johan; Marah, Foday; Delft, Diede van; Spector, Antoinette L.; Cassidy, Laura D.; Groen, Reinou S.; Jabbi, Sonnia-Magba Bu-Buakei; Bah, Silleh; Medo, James A.. (2022) PREvalence Study on Surgical COnditions (PRESSCO) 2020: A Population-Based Cross-Sectional Countrywide Survey on Surgical Conditions in Post-Ebola Outbreak Sierra Leone. World Journal of Surgery
  Academic article
• Kesteren, Jurre van; Meylahn-Jansen, Pauline J.; Conteh, Amara; Lissenberg-Witte, Birgit I.; van Duinen, Aalke Johan; Ashley, Thomas; Bonjer, H. Jaap; Bolkan, Håkon Angell. (2022) Inguinal hernia surgery learning curves by associate clinicians. Surgical Endoscopy
  Academic article
• Bakke, Eirik; Øseth, Eirik; Fofanah, Tairu; Sesay, Ibrahim; van Duinen, Aalke Johan; Bolkan, Håkon Angell; Westendorp, Josien; Lonnee-Hoffmann, Risa. (2022) Vacuum births and barriers to its use: An observational study in governmental hospitals in Sierra Leone. BMJ Open
  Academic article
• Adde, Håvard Askim; van Duinen, Aalke Johan; Andrews, Benetta; Bakker, Juul Marlies; Goyah, Kezelebah; Salvesen, Øyvind Olav; Sheriff, Swaliho; Utam, Terseer; Yaskey, Clarence; Weiser, Thomas G.. (2022) Mapping population access to essential surgical care in Liberia using equipment, personnel, and bellwether capability standards. British Journal of Surgery
  Academic article

2021

• Sevalie, Stephen; Youkee, Daniel; van Duinen, Aalke Johan; Bailey, Emma; Bangura, Thaimu; Mangipudi, Sowmya; Mansaray, Esther; Odland, Maria Lisa; Parmar, Divya; Samura, Sorie. (2021) The impact of the COVID-19 pandemic on hospital utilisation in Sierra Leone. BMJ Global Health
  Academic article
• Sung, Sophia; Hørthe, Hilde; Svendsen, Øyvind Veel; van Duinen, Aalke Johan; Salvesen, Øyvind; Vandi, Alphonsus; Bolkan, Håkon Angell. (2021) Early evaluation of the transition from an analog to an electronic surgical logbook system in Sierra Leone. BMC Medical Education
  Academic article
• Adde, Håvard Askim; Duinen, Aalke Johan van; Sherman, L.M.; Andrews, B.C.; Salvesen, Øyvind; Dunbar, N.K.; Bleah, A.J.; Weiser, T.G.; Bolkan, Håkon Angell. (2021) A Nationwide Enumeration of the Surgical Workforce, its Production and Disparities in Operative Productivity in Liberia. World Journal of Surgery
  Academic article
• Ahlback, Johan Gottfried; van Duinen, Aalke Johan; Brudal, Frank; Endreseth, Birger Henning; Bolkan, Håkon Angell. (2021) Effekt av Covid-19 pandemien på innleggelser og behandling av akuttkirurgisk pasienter i Midt-Norge. Kirurgen
  Professional article
• Geraedts, Tessa J. M.; Boateng, Daniel; Lindenbergh, Karel C.; Delft, Diede Van; Mathéron, Hanna M.; Mönnink, Gulia L. E.; Martens, Janine P. J.; Leerdam, Daniel van; Nunes, Jonathan H. Vas; Jabbi, Sonnia-Magba Bu-Buakei. (2021) Evaluating the cascade of care for hypertension in Sierra Leone. Tropical medicine & international health
  Academic article
• Gjøra, Andreas; Lindheim-Minde, Barbro; Bakker, Juul Marlies; van Duinen, Aalke Johan; Leerdam, Daniel van; Smalle, Isaac O; Bundu, Ibrahim; Bolkan, Håkon Angell. (2021) Changes in surgical volume, workforce, and productivity in Sierra Leone between 2012 and 2017. Surgery
  Academic article
• van Duinen, Aalke Johan; Westendorp, Josien; Ashley, Thomas; Hagander, Lars; Holmer, Hampus; Koroma, Alimamy P.; Leather, Andy J.M.; Shrime, Mark G.; Wibe, Arne; Bolkan, Håkon Angell. (2021) Catastrophic expenditure and impoverishment after caesarean section in Sierra Leone: An evaluation of the free health care initiative. PLOS ONE
  Academic article
• Ashley, Thomas; Ashley, Hannah; Wladis, Andreas; Bolkan, Håkon Angell; van Duinen, Aalke Johan; Beard, Jessica; Kalsi, Hertta; Palmu, Juuli; Nordin, Pär; Kristina, Holm. (2021) Outcomes After Elective Inguinal Hernia Repair Performed by Associate Clinicians vs Medical Doctors in Sierra Leone: A Randomized Clinical Trial. JAMA Network Open
  Academic article
• Bolkan, Håkon Angell; van Duinen, Aalke Johan. (2021) CapaCare 10 years, 2011 – 2021. CapaCare International
  Popular science monograph
• Bakker, Juul Marlies; van Duinen, Aalke Johan; Nolet, Wouter W.E.; Mboma, Peter; Sam, Tamba; Broek, Ankie van den; Flinkenflögel, Maaike; Gjøra, Andreas; Lindheim-Minde, Barbro; Kamanda, Samuel. (2021) Barriers to increase surgical productivity in Sierra Leone: A qualitative study. BMJ Open
  Academic article

2020

• Lonnee, Herman; Taule, Katinka; Sandvand, Johannes Knoph; Koroma, Michael M.; Dumbuya, Abubakar; Jusu, Kakpama S.K.; Shour, Mohamed A.; van Duinen, Aalke Johan. (2020) A survey of anaesthesia practices at all hospitals performing caesarean sections in Sierra Leone. Acta Anaesthesiologica Scandinavica
  Academic article
• van Duinen, Aalke Johan; Westendorp, Josien; Kamara, Michael M; Forna, Fatu; Hagander, Lars; Rijken, Marcus J.; Leather, Andy J.M.; Wibe, Arne; Bolkan, Håkon Angell. (2020) Perinatal outcomes of cesarean deliveries in Sierra Leone: A prospective multicenter observational study. International Journal of Gynecology & Obstetrics
  Academic article
• Duinen, Aalke Johan van; Adde, Håvard Askim; Fredin, Hans Ola; Holmer, Hampus; Hagander, Lars; Koroma, Alimamy Philip; Koroma, Michael M.; Leather, Andy; Wibe, Arne; Bolkan, Håkon Angell. (2020) Travel time and perinatal mortality after emergency caesarean sections: an evaluation of the 2-hour proximity indicator in Sierra Leone. BMJ Global Health
  Academic article
• Adde, Håvard Askim; van Duinen, Aalke Johan; Oghogho, Mark Deenize; Dunbar, Nelson; Tehmeh, Lekilay; Hampaye, Theophilus; Salvesen, Øyvind; Weiser, Thomas G.; Bolkan, Håkon Angell. (2020) Impact of surgical infrastructure and personnel on volume and availability of essential surgical procedures in Liberia. BJS Open
  Academic article

2019

• Drevin, Gustaf; Alvesson, Helle Mölsted; van Duinen, Aalke Johan; Bolkan, Håkon Angell; Koroma, Alimamy philip; Schreeb, Johan von. (2019) ”For this one, let me take the risk”: why surgical staff continued to perform caesarean sections during the 2014–2016 Ebola epidemic in Sierra Leone. BMJ Global Health
  Academic article
• Husby, Anne; van Duinen, Aalke Johan; Aune, Ingvild. (2019) Caesarean birth experiences. A qualitative study from Sierra Leone. Sexual & Reproductive HealthCare
  Academic article
• van Duinen, Aalke Johan; Kamara, Michael M.; Hagander, Lars; Ashley, Thomas; Koroma, Alimamy Philip; Leather, Andy J.M.; Elhassein, Mohammed; Darj, Elisabeth; Salvesen, Øyvind; Wibe, Arne. (2019) Caesarean section performed by medical doctors and associate clinicians in Sierra Leone. British Journal of Surgery
  Academic article
• Svendsen, Øyvind Veel; Helgerud, Christoffer; van Duinen, Aalke Johan; Salvesen, Øyvind; George, Peter M.; Bolkan, Håkon Angell. (2019) Evaluation of a surgical task sharing training programme's logbook system in Sierra Leone. BMC Medical Education
  Academic article
• Holmer, Hampus; Kamara, Michael M.; Bolkan, Håkon Angell; van Duinen, Aalke Johan; Conteh, Sulaiman; Forna, Fatu; Hailu, Binyam; Hansson, Stefan R.; Koroma, Alimamy Philip; Koroma, Michael M.. (2019) The rate and perioperative mortality of caesarean section in Sierra Leone. BMJ Global Health
  Academic article

2018

• Waalewijn, Bart; van Duinen, Aalke Johan; Koroma, Alimamy Philip; Rijken, Markus J.; Elhassein, Mohammed; Bolkan, Håkon Angell. (2018) Important Research Elements in Aiding Training: Reply. World Journal of Surgery
  Commentary
• Bolkan, Håkon Angell; van Duinen, Aalke Johan; Samai, Mohammed; Bash-Taqi, Donald Alpha; Gassama, Ibarahim; Waalewijn, Bart; Wibe, Arne; Schreeb, Johan von. (2018) Admissions and surgery as indicators of hospital functions in Sierra Leone during the west-African Ebola outbreak. BMC Health Services Research
  Academic article

2017

• Waalewijn, Bart; van Duinen, Aalke Johan; Koroma, AP; Rijken, Markus J.; Elhassein, Mohammed; Bolkan, Håkon Angell. (2017) Learning Curve Characteristics for Caesarean Section Among Associate Clinicians: A Prospective Study from Sierra Leone. World Journal of Surgery
  Academic article
• Bolkan, Håkon Angell; van Duinen, Aalke Johan; Waalewijn, Bart; Elhassein, Mohamed; Kamara, T. B.; Deen, G F; Bundu, Ibrahim; Ystgaard, Brynjulf; Schreeb, Johan von; Wibe, Arne. (2017) Safety, productivity and predicted contribution of a surgical task-sharing programme in Sierra Leone. British Journal of Surgery
  Academic article

2016

• Brolin, Kim; van Duinen, Aalke Johan; Nordenstedt, Helena; Hoijer, J; Molnes, Ragnhild; Frøseth, Torunn Wigum; Koroma, AP; Darj, Elisabeth; Bolkan, Håkon Angell; Ekström, A. (2016) The Impact of the West Africa Ebola Outbreak on Obstetric Health Care in Sierra Leone. PLOS ONE
  Academic article

2014

• van Duinen, Aalke Johan; Waalewijn, Bart; Ystgaard, Brynjulf; Bolkan, Håkon Angell. (2014) Strengthening of the Sierra Leonean Health System by Implementing a Surgical Task Shifting Programme. MT Bulletin of the Netherlands Society for Tropical Medicine and International Health
  Professional article

2013

• van Duinen, Aalke Johan; Westendorp, J; Ashley, T; Bash-Taqi, D; Jorgensen, P; Bolkan, Håkon Angell. (2013) The surgical training program: increasing surgical capacity in sierra leone by training medical doctors and community health officers in surgical and obstetric skills - progress report. Tropical medicine & international health
  Conference abstract