1. 42. Mayes G. Frozen in time: Disposition of frozen embryos gives rise to ethical, legal, and yes . . . political considerations. Medscape Ob/Gyn Women’s Health 2003; 8:1.
2. 32. Bonacich P. Four kinds of social dilemmas within exchange networks. Current Research Soc Psych 1995; 1:1–7.
3. 41.Kings Fund Centre Counselling Committee. Report on Counselling for Regulated Infertility Treatments, United Kingdom, 1991.
4. 8.European Union Tissue and Cells Directive, 2004/23 E. C. of the European Parliament and the Council (2004) O.J. L102/48 (March 31, 2004).
5. 30. Lawler EJ . An affect theory of social exchange. Am J Soc 2001; 107:321–52.