[1] Mahidol Univ, Ramathibodi Hosp, Dept Pediat, Bangkok 10400, Thailand
[2] Mahidol Univ, Ramathibodi Hosp, Dept Pathol, Bangkok 10400, Thailand
[3] Mahidol Univ, Ramathibodi Hosp, Dept Internal Med, Bangkok 10400, Thailand
[4] Mahidol Univ, Ramathibodi Hosp, Bone Marrow Transplant Program, Bangkok 10400, Thailand