G. Norman, F. Sridhar, G. Guyatt, und S. Walter. Medical care, 39 (10):
1039-47(Oktober 2001)4454<m:linebreak></m:linebreak>LR: 20041117; PUBM: Print; JID: 0230027; CIN: Med Care. 2001 Oct;39(10):1037-8. PMID: 11567166; ppublish;<m:linebreak></m:linebreak>MDCI.
R. Jaeschke, J. Singer, und G. Guyatt. Controlled clinical trials, 10 (4):
407-15(Dezember 1989)4453<m:linebreak></m:linebreak>LR: 20071115; PUBM: Print; JID: 8006242; ppublish;<m:linebreak></m:linebreak>MDCI.
T. Troosters. The European respiratory journal, 37 (4):
755-6(April 2011)6295<m:linebreak></m:linebreak>JID: 8803460; CON: Eur Respir J. 2011 Apr;37(4):784-90. PMID: 20693247; ppublish;<m:linebreak></m:linebreak>MDCI.