K. Schulz, D. Altman, und D. Moher. Annals of internal medicine, 152 (11):
726-32(Juni 2010)5545<m:linebreak></m:linebreak>JID: 0372351; aheadofprint;<m:linebreak></m:linebreak>Publicació.
C. Koch, und J. Gobell. Behavior research methods, instruments, & computers : a journal of the Psychonomic Society, Inc, 31 (1):
7-13(Februar 1999)4121<m:linebreak></m:linebreak>LR: 20001218; PUBM: Print; JID: 8413015; ppublish;<m:linebreak></m:linebreak>Formació.