Funding for this research was provided by:
National Natural Science Foundation of China (No.81800302)
Provincial Natural Science Foundation of Hunan (No.2019JJ50871)
China International Medical Foundation (Z-2016-23-2001-14)
Received: 16 May 2021
Accepted: 9 September 2021
First Online: 18 September 2021
: The study protocol conformed to the ethical guidelines of the Declaration of Helsinki as reflected by prior approval from the human research committee of the Second Xiangya Hospital of Central South University. Written informed consent was obtained from patients while the patient was in a clinically stable, non-congested condition or their family members who can give informed consent on behalf of patients after they were informed about the objectives and procedures of the study. Their rights to refuse participation any time they want were assured. For this purpose, a one-page consent letter was attached as a cover page of each questionnaire stating the general objective of the study and issues of confidentiality that was discussed by the data collectors before proceeding to the data collection.
: Not applicable.
: The authors have no conflicts of interest to disclose.