Author M. Gulliford A. Prevost J. Charlton D. Juszczyk J. Soames L. McDermott K. Sultana M. Wright R. Fox A. Hay P. Little M. Moore L. Yardley M. Ashworth Year of Publication 2019 DOI 10.1136/bmj.l236 DOIGoogle ScholarBibTeXEndNote X3 XMLEndNote 7 XMLEndnote taggedMarcRIS