Determinants and outcomes of physical activity in patients with COPD: a systematic review

The PRISMA Statement for Reporting Systematic Reviews and Meta-Analyses of Studies That Evaluate Health Care Interventions: Explanation and Elaboration

(2013) Alessandro Liberati   ANNALS OF INTERNAL MEDICINE

GRADE guidelines: A new series of articles in the Journal of Clinical Epidemiology

(2010) Gordon H. Guyatt et al.   JOURNAL OF CLINICAL EPIDEMIOLOGY

The GRADE approach and Bradford Hill's criteria for causation

(2010) H. Schunemann et al.   JOURNAL OF EPIDEMIOLOGY AND COMMUNITY HEALTH

Physical inactivity in patients with COPD, a controlled multi-center pilot-study

(2010) Thierry Troosters et al.   RESPIRATORY MEDICINE

Consequences of physical inactivity in chronic obstructive pulmonary disease

(2010) Jorine E Hartman et al.   Expert Review of Respiratory Medicine

Time-Dependent Confounding in the Study of the Effects of Regular Physical Activity in Chronic Obstructive Pulmonary Disease: An Application of the Marginal Structural Model

(2008) Judith Garcia-Aymerich et al.   ANNALS OF EPIDEMIOLOGY