title: Power and sample size: how many patients do I need?
authors.affiliation: Providence Health & Services, Portland, Oregon, USA.
authors.forename: Gary L
authors.initials: GL
authors.lastname: Grunkemeier
authors.forename: Ruyun
authors.initials: R
authors.lastname: Jin
mesh_terms: D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use; D007611:Aprotinin / Q000627:therapeutic use; D001281:Atrial Fibrillation / Q000209:etiology / Q000517:prevention & control; D003627:Data Interpretation, Statistical; D005188:False Negative Reactions; D005189:False Positive Reactions; D019918:Heart Valve Prosthesis Implantation / Q000009:adverse effects; D006801:Humans; D012107:Research Design; D018401:Sample Size
chemical_list: D000889:Anti-Arrhythmia Agents; D007611:Aprotinin