Authors: Joanne E Croker; Dawn R Swancutt; Martin J Roberts; Gary A Abel; Martin Roland; John L Campbell Journal: BMJ Open Date: 2013-05-28 Impact factor: 2.692
Authors: Tim Doran; Evangelos Kontopantelis; Jose M Valderas; Stephen Campbell; Martin Roland; Chris Salisbury; David Reeves Journal: BMJ Date: 2011-06-28