Guan, Weihua
Clay, Sandra J.
Sloan, Gloria J.
Pretlow, Lester G.
Article History
Received: 29 March 2018
Revised: 24 May 2018
Accepted: 12 June 2018
First Online: 24 June 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Since this study was a retrospective study, informed consent was not required.