... and data analysis. BE was involved in study design and datacollection. UM was involved in data management, statistical analysis anddata interpretation. RS was involved in study design, data ... design, data analysis and interpretation, andwriting of the manuscript. DF, MS and FW were involved in data analysisand interpretation, and writing of the manuscript. WK was involved in studydesign ... data analysis, andwriting of the manuscript. All authors read and approved the finalmanuscript.Competing interestsAV was a member of a Baxter advisory board and received as such anhonorarium....