1. Nobody named Mengele.
2. Avoid those who've gotten their medical training in any country without vowels in its name.
3. Check out his/her profile picture. Anyone who's probing your privates should look as good as someone you'd consider dating.
4. Google the address of the clinic; make sure it's not located in a crack house.
5. Check the profile for attributes that are important to you, like "generous painkiller prescription policy," "accepts payment via barter system" or "fewer than 25 wrongful-death suits within past 5 years."