P. Nieminen, J. Carpenter, G. Rucker, und M. Schumacher. BMC medical research methodology, (Januar 2006)4347<m:linebreak></m:linebreak>LR: 20071115; PUBM: Electronic; DEP: 20060901; JID: 100968545; PMC1570136; 2006/04/17 received; 2006/09/01 accepted; 2006/09/01 aheadofprint; epublish;<m:linebreak></m:linebreak>Publicació.