Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 105-2320-B-038-044, MOST105-2628-B-038 -006 -MY3, MOST104-2314-B-038-045-MY3, MOST 104-2320-B-038-055-MY3)
Taipei Medical University (105TMU-WFH-04)
National Health Research Institutes (NHRI-EX106-10308BC)
Health and Welfare Surcharge of Tobacco Products (MOHW106-TDU-B-212-144001)
Received: 12 September 2017
Accepted: 1 February 2018
First Online: 19 February 2018
Ethics approval and consent to participate
: We followed the guideline of the Taipei Medical University-Joint Institutional Review Board (approval no.: 201,311,034).
: Not applicable.
: The authors declare that they have no competing interests.
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