1. Department of Pediatrics; Chang Gung Memorial Hospital at Keelung and Chang Gung University College of Medicine; Taoyuan Taiwan
2. Community Medicine Research Centre; Chang Gung Memorial Hospital; Keelung Taiwan
3. Division of Pediatric Pulmonology; Chang Gung Memorial Hospital; College of Medicine; Chang Gung University; Taoyuan Taiwan
4. Department of Obstetrics and Gynecology; Chang Gung Memorial Hospital at Keelung and Chang Gung University College of Medicine; Taoyuan Taiwan
5. Division of Allergy, Asthma and Rheumatology; Department of Pediatrics; Chang Gung Memorial Hospital and Chang Gung University College of Medicine; Taoyuan Taiwan