Comorbidity and health related quality of life in people with a chronic medical condition in randomised clinical trials: an individual participant data meta-analysis

Elaine Butterly, Peter Hanlon, Anoop S. Shah, Laurie Hannigan, Emma McIntosh, J Lewsey, Sarah H. Wild, Bruce Guthrie, Frances S Mair, David M Kent, Sofia Dias, Nicky J. Welton, McAllister David^*

^*Corresponding author for this work