If you and your partners are doctors, I assume you'll pass the liquidity test. I also assume this is a solid/captive location where you're assured business. That's a key. I know someone who got killed on Quizno's franchises in the wrong places.
Location is key....you need to have one big winner if you have to have multiple locations. They're not all going to be huge winners. I have an acquaintance with 5 Guys franchises. Only one of them does REALLY well. The others (4) are just OK.