JJ designed and implemented the methods, performed the analysis, and wrote the manuscript; JW participated in developing the methods and writing the manuscript; IS supervised the development of the methods, implementation, analysis, and writing the manuscript.
All authors contributed to the critical evaluation of the methods, analysis and writing.
MSL participated in the study design, oversaw the data collection, performed the statistical analysis, supervised the data analysis and wrote most of the methods, results and conclusions sections.
JJ and SC are both responsible for the development of the methods, analysis of the example and writing of the manuscript.
SLB carried out the statistical analysis and writing of the methods and results.
CO was involved in the analysis of the data, development of the figures, and wrote the methods section of the manuscript.
BF planned the study, supervised the data analysis, and wrote the Introduction, much of the Methods and Results, and most of the Discussion.
CO chaired the focus group discussions, supplied the transcription of data and the main analysis of findings, and wrote the first drafts of the methods and results.
JSH contributed to the design of study and methods, performed statistical analysis and interpretation of data, and wrote the manuscript.
LS wrote portions of the methods and results, performed the analysis of microarray data and development of the figures.
