From my research Crisler and Nebbeling didn't get along at one point. When they emailed about this it didn't feel right to me so I looked elsewhere. I would have liked to hear more about what happen. There was hints that something was off in Michigan after Crisler died.
Whoever was helping Crisler patients find new doctors didn't provide all that much and seemed to try and steer you to Nebbeling by doing so. There may have been nothing to it but that's how I felt.