title: Apples, oranges, and statistical magic: Limitations of registry studies and need for collaborative studies.
authors.affiliation: Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: Simon
authors.initials: S
authors.lastname: Urschel
mesh_terms: D005260:Female; D006084:Graft Rejection / Q000517:prevention & control*; D006333:Heart Failure / Q000601:surgery*; D016027:Heart Transplantation; D006801:Humans; D008297:Male; D013256:Steroids / Q000008:administration & dosage*
chemical_list: D013256:Steroids