Media type: E-Article Title: When (Not) to Stop a Clinical Trial for Benefit Contributor: Pocock, Stuart J. Published: American Medical Association (AMA), 2005 Published in: JAMA, 294 (2005) 17, Seite 2228 Language: English DOI: 10.1001/jama.294.17.2228 ISSN: 0098-7484 Origination: Footnote: