Authorship
C.M.S., M.F., H.S.K., L.M., C.R. and H.R. designed the study. H.R. was the study coordinator and contributed by supervising field data collection, quality control and the conceptualisation and design of the manuscript. H.R. wrote the first draft of the manuscript, coordinated the statistical analysis, interpretation of the result and remarks from all co-authors. C.R. performed the power calculation and statistical analyses and assisted with the interpretation of the result. R.N., M.V., L.M., H.S.K., C.R., M.F., C.M.S. edited the manuscript. M.F. and C.M.S. supervised the study. All authors actively participated in the field data collection, writing of the manuscript and gave final approval for publication.