Itís a healing philosophy thatís also at the core of an experimental treatment being pioneered by Eisenberg and Dream Doctors: clown-assisted in vitro fertilization. ďI only visit the patient after the in vitro procedure,Ē Eisenberg clarifies. The theory is that, much as laughter contributes to healing by reducing sick peopleís stress, a little levity could have the same effect on fertility patients. Research backs this up. In a study conducted by Dr. Shevach Friedler of the Assaf Harofeh Medical Centre in Israel, 219 women undergoing IVF were visited by clowns for 15 minutes after embryo implantation. Thirty-six percent of them became pregnant.