Authors’ contributions
Guarantor of the article: Ying-Ying Lu. All authors were involved in patients’ enrollment, performing the study, acquisition of data and interpretation of study results. Meng-Yan Cui and Meng-Jie Zhang drafted the manuscript. Ying-Ying Lu and Lun-Gen Lu were involved in the study design and critical revision of the manuscript. All authors approved the final version of the manuscript, including the authorship list.