1. Food and Drug Administration IRB Information Sheets
http://www.fda.gov/oc/ohrt/irbs/toc4.html#payment
(2001).
2. US Department of Health and Human Services IRB Guidebook
http://www.hhs.gov/ohrp/irb/irb_chapter3.htm
(1993).
3. The Clinical Research Volunteer Program for Healthy Volunteers at the National Institutes of Health;
http://www.cc.nih.gov/ccc/prrc/healthyvols.html
(21 June 2006).
4. NIH Remuneration of Research Subjects in the Intramural Research Program
http://www.nihtraining.com/ohsrsite/info/sheet20.html
(2000).
5. Delvigne, A. & Rozenberg, S. Hum. Reprod. Update 8, 559–577 (2002).