1. Department of Pediatrics, 2nd Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China.
2. Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
3. Department of Pediatrics, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
4. Department of Pediatrics, Yunnan Provincial Hospital of Traditional Chinese Medicine, Kunming, Yunnan, China.
5. Department of Pediatrics, Yan'an Hospital of Kunming City, Kunming, Yunnan, China.