[1] Department of Pediatrics,
[2] Tohoku University School of Medicine,undefined
[3] 1-1 Seiryo-machi,undefined
[4] Aoba-ku,undefined
[5] Sendai 980-8574,undefined
[6] Japan Tel. +81-22-717-7287; Fax +81-22-717-7290 e-mail: tohura@ped.med.tohoku.ac.jp,undefined
[7] Department of Pediatrics,undefined
[8] Shiga Medical Center for Children,undefined
[9] Shiga,undefined
[10] Japan,undefined
[11] Department of Community Health Nursing,undefined
[12] Faculty of Nursing,undefined
[13] Shiga University of Medical Science,undefined
[14] Shiga,undefined
[15] Japan,undefined