[1] Princess Margaret Hosp, Pediat, Nassau, Bahamas
[2] Univ W Indies, SCMR, Nassau, Bahamas
[3] Univ W Indies, Dept Child Hlth, Kingston 7, Jamaica
[4] Hosp Sick Children, Dept Paediat Lab Med, Haematopathol Div, Toronto, ON M5G 1X8, Canada
[5] Hosp Sick Children, Ctr Global Child Hlth, Toronto, ON M5G 1X8, Canada
[6] Univ W Indies, Bridgetown, Barbados
[7] Univ W Indies, Dept Clin Med Sci, Fac Med Sci, Port Of Spain, Trinidad Tobago
[8] Univ Toronto, Hosp Sick Children, Dept Pediat, Div Haematol Oncol, Toronto, ON M5G 1X8, Canada
[9] Hosp Sick Children, Diagnost Imaging, Toronto, ON M5G 1X8, Canada
[10] Univ Toronto, Med Imaging, Toronto, ON, Canada
[11] Princess Margaret Canc Ctr, Dept Radiat Oncol, Toronto, ON, Canada
[12] Bustamante Hosp Children, Pediat, Kingston, Jamaica
[13] Hosp Sick Children, Dept Paediat Lab Med, Toronto, ON M5G 1X8, Canada
[14] Hosp Sick Children, Paediat Lab Med, Toronto, ON M5G 1X8, Canada
[15] Community Child Hlth Serv, Minist Hlth, St Lucia, Qld, Australia
[16] Milton Cato Mem Hosp, Pediat, Kingstown, St Vincent & Gr, England