[1] Ambrose Alli Univ, Dept Family Med, Ekpoma, Nigeria
[2] Irrua Specialist Teaching Hosp, Dept Family Med, Irrua, Nigeria
[3] Afriwon Renaissance Educ & Training Subgrp, Gusau, Nigeria
[4] Fed Med Ctr, Dept Family Med, Gusau, Nigeria
[5] Univ Coll Hosp, Dept Family Med, Ibadan, Nigeria
[6] Univ Benin, Dept Family Med, Benin, Nigeria
[7] Univ Benin, Dept Family Med, Teaching Hosp, Benin, Nigeria
[8] Ahmadu Bello Univ, Teaching Hosp, Dept Family Med, Zaria, Nigeria
[9] Cent Hosp, Dept Family Med, Benin, Benin
[10] Univ Jos, Dept Family Med, Jos, Nigeria
[11] Jos Univ, Dept Family Med, Teaching Hosp, Jos, Nigeria
[12] Univ Ibadan, Dept Community Med, Family Med Unit, Ibadan, Nigeria