Author S. Julious M. Horspool S. Davis M. Franklin W. Smithson P. Norman R. Simpson H. Elphick O. Bortolami C. Cooper Year of Publication 2018 DOI 10.1136/bmjopen-2017-017367 DOIGoogle ScholarBibTeXEndNote X3 XMLEndNote 7 XMLEndnote taggedMarcRIS