Authors’ contributions
RECRUITMENT
JG: Study design, patient recruitment, data collection, data analysis and writing up of the first draft of the paper. JN: Patient recruitment, data collection, data analysis and agreement to be accountable for all aspects of the work thereby ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. YX, YM: Patient recruitment, data collection. JZ: Drawing picture. The author(s) read and approved the final manuscript.