“…The recruitment processes varied by each major of the students and all details have been reported in previous publications for students majoring in medicine, health management, nursing, and pharmacy. [23][24][25][26] In brief, a multistage sampling design was used. First, according to the geographical location and the economic development level, 11 provinces were selected which were located in the east (Beijing, Hebei, Shandong, Jiangsu), middle (Henan, Shanxi), west (Shaanxi, Ningxia, Gansu), and northeast of China (Heilongjiang, Liaoning) (Figure S1).…”