Funding for this research was provided by:
Health Promotion Administration, Ministry of Health and Welfare (DOH99-HP-1702, DOH94-HP-1802, DOH96-HP-1702, DOH95-HP-1802)
Received: 24 September 2020
Accepted: 27 March 2021
First Online: 7 April 2021
: The protocol of this study was approved by the institutional review board of the Health Promotion Administration, Taiwan. Written informed consent was obtained at each stage of the study from the main caregiver after a detailed explanation of the study.
: Not applicable.
: The authors declare that they have no competing interests.