Acknowledgments
We thank Prof Shingo Fujii (Kyoto University, Japan), Prof Aikou Okamoto (School of Medicine, Jikei University, Japan), Prof László Ungár (Duna Medical Center, Budapest, Hungary), Prof Wei-Guo Lu (Women’s Hospital, School of Medicine, Zhejiang University, China), and Dr Liang Chen (Shandong Cancer Hospital, Shandong University, China) for their assistances in contacting the authors. We thank Prof Tomohito Tanaka (Osaka Medical College, Japan), Prof Yoshito Terai (Kobe University Graduate School of Medicine, Japan), Prof Robert Póka (University of Debrecen, Hungary), and Prof Han-Mei Lou (Zhejiang Cancer Hospital, Zhejiang University, China) for their works and patience in re-examining the pathological data of their patients. We thank all the respondents in our questionnaire survey no matter whether they provided eligible data. This study was funded by Health and Medical Cooperation Innovation Special Program of Guangzhou Municipal Science and Technology (grant number: 158100075).