Received: 18 March 2020
Accepted: 29 April 2020
First Online: 1 July 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee Review Board of Hue Central Hospital under the reference number: HCH-05052012. Confidentiality was ensured by not writing the names of patients on proforma in accordance with the Helsinki Declaration. Written informed consent was obtained from all patients before the study. The steps of operative interferences were explained to all patients. The local ethics committee approved all operative procedures.
: Not applicable. The manuscript does not contain any individual person’s data.
: The authors declare that they have no competing interests.