1. Institute of Tropical Disease Research & Prevention; Nigeria Effective Health Care Alliance Programme; University of Calabar Teaching Hospital Moore Road Calabar Cross River State Nigeria
2. Norwegian Knowledge Centre for the Health Services; Postboks 7004 St. Olavs plass Oslo N-0130 Norway
3. University of Calabar; Department of Public Health, College of Medical Sciences; Calabar Cross River State Nigeria PMB 11115
4. Federal Medical Centre; Department of Internal Medicine; Umuahia Nigeria
5. Justus-Liebig-University; Institute of Nutritional Sciences - International Nutrition; Wilhelmstr 20 Giessen Germany D-35392