[1] Univ Lagos, Dept Paediat, Coll Med, Lagos, Nigeria
[2] Univ Benin, Dept Child Hlth, Paediat Cardiol Unit, Teaching Hosp, Benin, Nigeria
[3] Univ Jos, Dept Paediat, Jos, Nigeria
[4] Ahmadu Bello Univ, Dept Paediat, Teaching Hosp, Zaria, Nigeria
[5] Lagos State Univ, Dept Paediat & Child Hlth, Coll Med, Lagos, Nigeria
[6] Univ Coll Hosp, Div Paediat Cardiol, Dept Paediat, Ibadan, Nigeria
[7] Natl Hosp, Dept Paediat, Abuja, Nigeria
[8] Univ Calabar, Dept Paediat, Teaching Hosp, Calabar, Nigeria
[9] Univ Port Harcourt, Dept Paediat, Coll Hlth Sci, Port Harcourt, Nigeria
[10] Olabisi Onabanjo Univ, Dept Paediat, Teaching Hosp, Shagamu, Nigeria
[11] Univ Uyo, Dept Paediat, Teaching Hosp, Uyo, Nigeria
[12] Fed Staff Hosp, Dept Paediat, Abuja, Nigeria
[13] Bikets Med Ctr, Surg Unit, Osogbo, Nigeria
[14] Univ Nigeria, Dept Paediat, Teaching Hosp, Enugu, Nigeria
[15] Usmanu Danfodiyo Teaching Hosptial, Dept Paediat, Sokoto, Nigeria
[16] Aminu Kano Teaching Hosp, Dept Paediat, Kano, Nigeria
[17] Zankli Hosp, Paediat Unit, Abuja, Nigeria
[18] Fed Med Ctr, Dept Paediat, Abeokuta, Nigeria
[19] Niger Delta Univ, Dept Paediat & Child Hlth, Teaching Hosp, Wilberforce Isl, Bayelsa State, Nigeria
[20] Univ Ilorin, Dept Paediat & Child Hlth, Ilorin, Nigeria
[21] Obafemi Awolowo Univ, Dept Paediat, Coll Hlth Sci, Ife, Nigeria