National Hospital Abuja, Aminu Kano Teaching Hospital, Aminu Kano Teaching Hospital, Federal Medical Centre Asaba, Federal Medical Centre Asaba, Federal Medical Centre Asaba, Federal Medical Centre Asaba, University of Lagos - Department of Paediatrics, University of Lagos - Department of Paediatrics, Lagos University Teaching Hospital, University of Lagos - Department of Paediatrics, National Hospital Abuja, National Hospital Abuja, University of Benin - University of Benin Teaching Hospital, University of Benin - University of Benin Teaching Hospital, University of Nigeria - Department of Paediatrics, University of Nigeria, University of Nigeria, Indiana University Purdue University Indianapolis (IUPUI) - Indiana University School of Medicine and Indiana University Purdue University Indianapolis (IUPUI) - Indiana University School of Medicine