How successful is a single Clinical Hypnotherapy session

To astonishment of many a single session might produce great results. Usually there's no physical proof of it, as conditions treated are mostly on psychological and behaviour level, there could not be conducted physical evidence of success besides of testimonial of the patient or in case of teenagers by their parents' words. 
However, as you can see in picture taken of young patient on day of first session on 6th August and picture taken on second meeting
on 24th August there's significant improvement. Teenager with self-harming tendencies seemed much calmer and with uplifted spirit too. We're so happy to be able to support younger generation.