A lack of regulation surrounding fertility services in India and the lucrative returns to those that provide them has turned the country into a popular hub of "IVF tourism." Childless couples from overseas are attracted by the relatively low-cost treatment, as well as "friendly rules" when it comes to egg donors and surrogate motherhood. According to the private Indian Society for Assisted Reproduction, there are some 400 IVF clinics in the country providing an estimated 30,000 assisted reproductive treatments a year. There are no precise estimates for what percentage are taken up by foreigners, but doctors say overseas demand is fuelling a boom.