Funding for this research was provided by:
National Natural Science Foundation of China (31372195)
Institute of Tibetan Plateau Research Chinese Academe of Sciences (XDA2010010103)
Received: 17 April 2019
Accepted: 27 December 2019
First Online: 13 January 2020
Ethics approval and consent to participate
: This study was approved by the Animal Ethics Committee of the Chinese Academy of Medical Sciences at Lanzhou University. All avian specimens were collected and handled in accordance with good animal practice as required by the Animal Ethics Procedures and Guidelines of the People’s Republic of China.
: Not applicable.
: The authors declare that they have no competing interests.