Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST, 106-2633-B-009-001)
Received: 22 January 2019
Revised: 25 June 2019
Accepted: 28 July 2019
First Online: 23 September 2019
Ethics approval and consent to participate
: All procedures for the sample acquisition have followed the tenets of the Declaration of Helsinki and have been approved by the Institutional Review Committee at Taipei Veterans General Hospital. The experiments were undertaken with the understanding and written consent of each subject.
: Not applicable.
: The authors declare that they have no competing interests.