Saudi Arabia offers opportunities for this reason. Door-to-door surveys are not possible in Saudi Arabia; a population-based survey by mobile telephone has been completed and is in analysis.

Pakistan is a much poorer country. Despite the security problems, a nationwide population-based door-to-door survey has been completed and is in analysis.

A burden-of-headache study is needed in at least one country of Arabian North Africa. In Egypt, a population-based door-to-door survey was at a stage of advanced planning, but put on hold in 2013 because of the security situation. In Morocco, a similar study in three regions of the country will enter the pilot phase soon.

Collaborators:

• A Ahmad, DOW University of Health Sciences, Karachi, Pakistan
• B Ahmed, DOW University of Health Sciences, Karachi, Pakistan
• M Al Jumah, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• A Al Khathaami, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• A Al Owayed, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• SZ Alvi, DOW University of Health Sciences, Karachi, Pakistan
• J Effendi, DOW University of Health Sciences, Karachi, Pakistan
• A El Etribi, Ain Shams University, Cairo, Egypt
• AA Herekar, DOW University of Health Sciences, Karachi, Pakistan
• AD Herekar, DOW University of Health Sciences, Karachi, Pakistan
• A Jawhari, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• N Kissani, CHU Mohamed VI, Marrakech, Morocco
• S Kojan, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• H Tamim, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
• UL Uqaili, DOW University of Health Sciences, Karachi, Pakistan
• Syed Zia, DOW University of Health Sciences, Karachi, Pakistan