Hoang, Huong Thi Xuan
Molassiotis, Alex
Chan, Choi Wan
Nguyen, Thi Huong
Liep Nguyen, Van
Article History
Received: 14 December 2018
Revised: 26 March 2019
Accepted: 30 March 2019
First Online: 23 April 2019
Compliance with ethical standards
: The study obtained ethical approval from the Human Subject Ethics Board, The Hong Kong Polytechnic University (Hong Kong SAR), and Hanoi School of Public Health (Vietnam).
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.