Funding for this research was provided by:
Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Indonesia (UPPM/7/M/05/04/04.15, UPPM/215/M/05/04/05.16)
Article History
Received: 25 February 2019
Accepted: 25 March 2019
First Online: 29 March 2019