He และ Hui. (2000) Risk factors of pneumonia among children under five years of age at Queen Sirikit National Institute of Child Health, Bangkok, Thailand. Mahidol University,:ม.ป.ท.He และ Hui. 2000. Risk factors of pneumonia among children under five years of age at Queen Sirikit National Institute of Child Health, Bangkok, Thailand. ม.ป.ท.:Mahidol University,;He และ Hui. Risk factors of pneumonia among children under five years of age at Queen Sirikit National Institute of Child Health, Bangkok, Thailand. ม.ป.ท.:Mahidol University, 2000. Print.