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Article History

Received: 12 December 2016

Accepted: 21 May 2018

First Online: 31 May 2018

Ethics approval and consent to participate

: This research was approved by Hanoi Medical University and the district health centers in Hanoi (Document No.0084/DHYHN-TTNCHTYT, and Document No. 825/QD-DHYHN). All participants gave verbal informed consent before inclusion in the study. The participants were informed about the study aims and themes discussed during the interview. Participants were informed of their right to withdraw from the study at any time, without additional questions or qualifications. Participants were encouraged to ask questions and seek more explanation if questions were unclear. Participants were made aware of the data collection process, including audio-recording and transcription of the interview. In addition, they were informed about a confidentiality clause, which specified that only the research team could access the study data, and all results were documented to ensure anonymity. All participants agreed prior to participation.

: The authors declare that they have no competing interests.

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