Search results
European Journal of Epidemiology > 2013 > 28 > 4 > 335-346
Journal of General Internal Medicine > 2012 > 27 > 9 > 1120-1126
European Journal of Epidemiology > 2013 > 28 > 4 > 335-346
Journal of General Internal Medicine > 2012 > 27 > 9 > 1120-1126