Contributors: AH and DK designed, initiated, and coordinated the study. DP assisted with the design, interpretation, and direction of the study. FP collected the data and assisted with their analysis and interpretation. The paper was written jointly by AH, DK, DP, and FP. AH and DK are guarantors for this study. Funding: Cambridge and Huntingdon Health Authority. Conflict of interest: None. 1 F...
