... to conception and design, analysis and interpretation of data, have been involved in drafting the manuscript and revising it critically for important intellectual content, and have given finalapproval ... Duisburg-Essen,Hufelandstraße 55, 45147 Essen, Germany.Authors’ contributionsXJ and HJ have made substantial contributions to acquisition of data and analysis and interpretation of data, have ... involved in drafting themanuscript and revising it critically for important intellectual content, and have given final approval of the version to be published. KM and WC havemade substantial...