2 Department of Respiratory and Critical Care Medicine, the Second Affiliated Hospital of Fujian Medical University, No. 950 Donghai Street, Fengze District, Quanzhou, Fujian 362000, China.
3 Sleep Medicine Key Laboratory of Fujian Province Educational Bureau, Fujian Medical University, No. 950 Donghai Street, Fengze District, Quanzhou, Fujian 362000, China.
4 Department of Clinical Nutrition, the Second Affiliated Hospital of Fujian Medical University, No. 950 Donghai Street, Fengze District, Quanzhou, Fujian 362000, China.
5 Respiratory Medicine Centre of Fujian Province, No. 950 Donghai Street, Fengze District, Quanzhou, Fujian 362000, China.
6 South China Hospital of Shenzhen University, Shenzhen, Guangdong 518000, China.