MS: Data entry, critical interpretation and diccussion of the results, manuscript revision.
AB participated in the project conceptualization, data entry, manuscript writing and data analysis, JQ assisted in data entry, manuscript writing and editing, LA, entered, coded and analyzed participants' responses.
JWN took part in data collection, data handling and preparation of the manuscript, MIM participated in organising and preparation of the manuscript, ENMS took part in data entry and the preparation of the manuscript.
The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-244X/11/14/prepub We thank Nick Emler (Surrey, UK) for proofreading the manuscript, and David Allemann for data entry and data management.
KR and HFr were part of the traveling team of investigators, conducted statistical analyses of the clinical data, assisted in manuscript writing, and supervised data entry, substantially performed by SG, SP, AK, MFG, VA, ATa, ATr, and MF.
FKD contributed in data collection, data entry and manuscript writing.
CP: Participated in data collection, laboratory work, data entry and manuscript writing.
LH and IM performed laboratory work, data entry, and manuscript preparation.
NH, SSH, AAK, MIA, MOI, HPM and AJ were involved in the data collection, data entry and manuscript writing.
PD is a resident who was responsible for project administration (radiographic measurements, data entry) and manuscript drafting.
