Ethics Approval
Ethics approval was obtained from the ethics committees of the School of Medicine in Xiamen University (XDYX2019013) and 2 university-affiliated hospitals (Zhongshan Hospital: XMZSYYKY2020-113 and First Affiliated Hospital: FA2020-037). All participants were informed that their participation was voluntary. Participants needed to complete informed consent before participation. All collected data were kept confidential and anonymous. Participants received a gift compensation (approximately US $4) after each evaluation.