Methodologic issues regarding background mortality in observational studies.
Ruben L J
RL
Osnabrugge
Stuart J
SJ
Head
Arie Pieter
AP
Kappetein
D001021:Aortic Valve / Q000601:surgery*; D001022:Aortic Valve Insufficiency / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000601:surgery*; D019918:Heart Valve Prosthesis Implantation / Q000401:mortality*; D006801:Humans