Piloting of draft data collection forms was undertaken to identify and resolve any problems.
CL Hsu contributed to manuscript draft, data collection and statistical analysis, KY Chen contributed to study design and statistical analysis, JY Shih, CC Ho and CH Yang participated in study design and data collection, CJ Yu and PC Yang contributed to manuscript revising.
MJ also drafted data collection instruments, trained data collectors, participated in pre-test, data collection, analysis and interpretation, drafted this paper, and was responsible for submission.
AJ designed the study, drafted data collection instruments, coordinated ethics reviews, reviewed, synthesized, and interpreted preliminary results, and reviewed and commented on the final revised manuscript.
MJ made substantial contributions to the conception and design, drafted data collection instruments, trained data collectors, participated in data collection, analysis and interpretation, drafted this paper, and was responsible for submission.
NEK developed the draft, conducted data collection and analysis, EGN developed the protocol for the study, and supervised data collection, UCU contributed in producing the draft.
PW participated in study design, edited drafts of data collection tools and was integral in drafting and revising the manuscript critically for important intellectual content.
MM conceived of the study, drafted the data collection protocols, conducted the statistical analyses and drafted the manuscript.
WZ assisted with the drafting of data collection instruments and other materials as well as data analysis and interpretation.
AJA conceived the project, developed draft instruments, supervised data collection and wrote drafts of findings.
NK reviewed and edited draft instruments, supervised data collection process, reviewed and edited draft manuscripts.
