Don't use a template, that's a bad idea. Write a thank you note that will help the interviewer remember who you are. Remind them of your super awesome qualities, or mention something you and your interviewer connected on or had in common. A thank you note shouldn't just be a polite gesture, it should also remind them of who you are, and help them to remember why YOU specifically should be a student at their medschool.
It shouldn't be a resume or a ramble about how awesome you are, but it should subtly hint at the fact that you would be a great fit at their school, that their student body is one you can see yourself being a part of, and that you'd make awesome contributions to their __specific program/teaching format/community involvement/classroom structure__ because of your __experience/personality/learning style/devotion to community health and service__. Thank them for taking the time out to interview prospective students, tell them that you really enjoyed your conversation (you especially enjoyed getting a chance to talk to them about your shared love of ___, or hearing about their perspective on moving from [your state] to [school's state], or hearing a little about their-super cool research - to show them that this isn't a generic fill-in-the-blanks-with-the-interviewer's-name-and-the-school thank-you note... cause... it's not... I'm totally not giving you blanks to fill in, or anything...)
Basically, thank them for interviewing you, and tell them what you enjoyed about your conversation and why it makes you think you'd be a great fit for the school in 5 sentences or less.