Received: 27 September 2018
Accepted: 5 March 2019
First Online: 10 April 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Shanghai Tongren Hospital and written consents were obtained from all patients involved.
: All the authors have read the manuscript and agreed with the evidence and conclusions in it. We confirm that this paper has not been published previously and if acceptable, will not be published elsewhere.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.