Risk of Pneumonia Hospitalization After Initiation of DPP-4 Inhibitors Versus Sulfonylureas
Among Patients With COPD and Type 2 Diabetes Treated With Metformin: A Nationwide
Register-Based Cohort Study
The association between frequent acute exacerbations of COPD and risk of kidney disease
Rheumatoid Arthritis and Bronchectasis: Hospital-treated Pneumonia and Mortality in
a Nationwide Population-Based Cohort Study 
The assocoation between severity of chronic obstructive pulmonary disease and the risk of major adverse cardiovascular events