A Ryan, J Ives, S Wilson and S. Greenfield
Family Practice 27 ( 5 ): 570 - 581 , 2010
A Ryan, S Wilson and S. Greenfield
Journal of Public Health 32 ( 4 ): 519 - 525 , 2010
C Gratus, S Damery, S Wilson, S Warmington, P Routledge, R Grieve, N Steven, J Jones and S. Greenfield
QJM: An International Journal of Medicine 102 ( 12 ): 831 - 842 , 2009