1 Department of Paediatrics, College of Medicine, University of Ibadan & University College Hospital, Ibadan, Oyo State, Nigeria.
2 Department of Pediatrics, University of Ilorin Teaching Hospital and University of Ilorin, Ilorin, Kwara State, Nigeria.
3 Faculty of Clinical Sciences, College of Medical Sciences Rivers State University and Department of Paediatrics, Rivers State University Teaching Hospital, Port Harcourt, Rivers State, Nigeria.
4 University College Hospital, Ibadan, Oyo State, Nigeria.
5 Gombe State University/ Federal Teaching Hospital Gombe, Gombe, Nigeria.
6 Department of Paediatrics, Nnamdi Azikiwe University Teaching Hospital, Nnewi, Anambra State, Nigeria.
7 Department of Paediatrics, Aminu Kano Teaching Hospital Kano, Kano, Nigeria.
8 Department of Paediatrics, University of Medical Sciences/Teaching Hospital Ondo, Ondo, Nigeria.