Received: 25 April 2019
Accepted: 7 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This study has been approved by Joint Institutional Review Board of Taiwan (JIRB no.: 19-S-002-1). Written informed consent was obtained from all participating patients (172 patients) for tandem colonoscopy.
: Not applicable.
: The authors declare that they have no competing interests.