Received: 26 March 2020
Accepted: 24 June 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: This study is a data analysis of the literature. The study protocol was approved by the Institutional Review Board of Jianan Psychiatric Center, Ministry of Health and Welfare, Taiwan [IRB No. 1X-0X0].
: Not applicable.
: The authors declare that they have no competing interests.