Contribution to Authorship
NW initiated the study which was conceptualized by L.I., A.H. and N.W. All authors were responsible for conduction of the study, though the first and last author had the main responsibility for the study and for the database also P.E.I. Data was collected by L.I., Y.C., R.B., C.J., M.L., K.K., A.H. M.W., E.I.W. and N.W. Data analysis and interpretation were conducted by L.I., P.E.I., A.H., K.K., Y.C., R.B. and N.W. All authors participated in writing the draft and all authors have approved the final manuscript.