Review Pragmatic trials in primary care. Methodological challenges and solutions demonstrated by the DIAMOND-study.
Fransen GA, van Marrewijk CJ, Mujakovic S, Muris JW, Laheij RJ, Numans ME, de Wit NJ, Samsom M, Jansen JB, Knottnerus JA. BMC Med Res Methodol. 2007 Apr 23; 7:16. Epub 2007 Apr 23.