G-Q Qian1, X Zhang2, A H Y Ma3, N-B Yang1. 1. Department of General Internal Medicine, Ningbo City First Hospital, No. 59 Liuting Street, Haishu District, Ningbo, Zhejiang Province 315010, China. 2. Department of Respiratory Medicine, Yueqing People's Hospital, Zhejiang Province, Wenzhou 325600, China. 3. Department of Finance, Nottingham University Business School, University of Nottingham Ningbo China, Ningbo City, Zhejiang Province 315100, China.