[_a]
aSchool of Public Health, Evidence-Based Social Science Research Center, Lanzhou University,
Lanzhou, China
[_b]
bEvidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University,
Lanzhou, China
[_c]
cKey Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province,
Lanzhou, China
[_d]
dChinese GRADE Centre, Lanzhou University, Lanzhou, China
[_e]
eGansu Chinese Medicine University, Lanzhou, China
[_f]
fChinese Medicine Faculty of Hong Kong Baptist University, Hong Kong, China
[_g]
gInstitute of Clinical Research and Evidence Based Medicine, Gansu Provincial Hospital,
Lanzhou, China
[_h]
hThe Center of Endoscopic Surgery of 451 Hospital of PLA, Xian, China
*Kehu Yang, Evidence-Based Medicine Center, School of Basic Medical Sciences; Evidence-Based
Social Sciences Research Center, Key Laboratory of Evidence Based Medicine and Knowledge
Translation of Gansu Province, 199 Donggang West Road, Lanzhou University, Lanzhou
730000 (PR China), E-Mail kehuyangebm2006@126.com, , Xinmin Yang, The Center of Endoscopic
Surgery of 451 Hospital of PLA, Xian 710054 (PR China), E-Mail yanxm200816@163.com
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