Montserrat-Capdevila J, Godoy P, Marsal JR, Barbe F, Galvan L. Risk of exacerbation in chronic obstructive pulmonary disease: a primary care retrospective cohort study. BMC Fam Pract. 2015 Dec 8;16:173. doi: 10.1186/s12875-015-0387-6
Gnanasakthy A, DeMuro-Mercon CJ. Logistical considerations for intergrating patient-reported outcomes in multiregional clinical trials. Clinical Researcher. 2015 Apr;45-8.