Article History

Received: 25 January 2019

Accepted: 24 May 2019

First Online: 6 June 2019

Ethics approval and consent to participate

: The protocol (FLU/CL/6/2017 dated 3 March 2016) of the study had been approved by the first hospital of Lanzhou University review board. The study had adhered to the law of China, the strengthening the reporting of observational studies in epidemiology (STROBE) statement, and the 2008 Helsinki Declaration. All enrolled patients had been signed an informed consent form regarding examinations, biopsies, pathology, and to have an additional procedure for research purpose only.

: All enrolled patients had been signed an informed consent form regarding publication of the study in all formats hard and electronics including personal data and images irrespective of time and language.

: The authors declare that they have no competing interests.