A lot of schools offer them, but I'm not sure anyone actually uses them. If you take a look a MSAR, it'll tell you how many matriculants in a med school's class were from EDP. From what I've noticed, a lot of schools that have EDP programs don't have any matriculants through their EDP program. I do know places like Yale, Cornell, and Pritzker have them, and generally, you'll know which schools have EDP if you just do a google search of "med school name+EDP".