1. Patient before and after photographs alone: In today's world of advanced photography, these can easily be "touched up" to give a false impression. 2. Patient refferals: A doctor may have just 10% satisfied patients but if he refers you to one of those 10%, you never come to know the fact that 90% are not satisfied. Rather opt for a "Sample" session. If he is a good transplant surgeon, he would never hesitate in demonstrating his skill. These both (select before after pictures and select referrals) are usually marketing gimmicks that have, unfortunately, been used to dupe a lots of simple minded patients by unscrupulous clinics.