BMJ Publishing Group, BMJ, aug18 2(339), p. b2273-b2273, 2009
DOI: 10.1136/bmj.b2273
Full text: Download
The author made a substantial contribution either to the conception and design of the study; or to the organisation of the conduct of the study; or to carrying out the study (including acquisition of study data); or to analysis and interpretation of study data.