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.