1. Department of Pediatrics, The Central Hospital of Huanggang, Huanggang, Hubei 438000, P.R. China
2. Department of Cardiology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, P.R. China
3. Department of Emergency, Huai'an First People's Hospital, Nanjing Medical University, Huai'an, Jiangsu 223300, P.R. China
4. Department of Emergency, The Affiliated Huai'an Hospital of Xuzhou Medical University and The Second People's Hospital of Huai'an, Huai'an, Jiangsu 223302, P.R. China