Thao Da Thi Tran1, Linda Murray2, Thang Van Vo3,4. 1. School of Health Sciences, College of Health, Massey University, Wellington, Aotearoa, New Zealand. 2. School of Health Sciences, College of Health, Massey University, Wellington, Aotearoa, New Zealand. l.murray1@massey.ac.nz. 3. Institute for Community Health Research, University of Medicine and Pharmacy, Hue University, Hue City, Vietnam. 4. Faculty of Public Health, University of Medicine and Pharmacy, Hue University, Hue City, Vietnam.