title: Trials and Observations: A Friendly Pointer on the Language of Study Design.
authors.affiliation: Mayo Clinic, Rochester, Minnesota. hyder.joseph@mayo.edu.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Hyder
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000523:psychology*; D003072:Cognition Disorders / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D011183:Postoperative Complications / Q000523:psychology*; D064266:Preexisting Condition Coverage