Shapuwei Community Health Service Center, Shenzhen Bao'an District Songgang People's Hospital, Shenzhen, Guangdong, 518105;
Department of Respiratory Medicine, Shenzhen Bao'an District Songgang People's Hospital, Shenzhen, Guangdong, 518105;
Department of Emergency, Shenzhen Bao'an District Songgang People's Hospital, Shenzhen, Guangdong, 518105;