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