Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (NSC 102-2314-B-006-025)
Received: 4 October 2019
Accepted: 28 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee (B-BR102–001) of National Cheng Kung University Hospital, Tainan, Taiwan. Written informed consent was obtained from each participant and her spouse.
: Not applicable.
: The authors declare that there were no competing interests.