SET = single embryo transfer.
This article (actually a letter to the editor of Human Reproduction - March 11, 2008) by M. Garel et.al. about the attitude of patients undergoing IVF toward twins is a fascinating read for anyone who is interested in the topic and likes reading articles in academic journals.
To me, the bottom line seems to be that asking patients about their attitude in a questionnaire doesn't give real information - does saying one doesn't want twins seem ungrateful? Is the reason for wanting twins the fear that one will only be able to achieve one successful pregnancy?
I'm still looking for a topic for my seminar paper in Survey Methodology. Ideally, it would have to do with surveys used with patients undergoing infertility treatments... but I need a specific angle that other people have researched (since I don't want to have to do statistical evaluations on my own questionnaire). Any ideas are welcome...