Dr. carl simonton is credited with introducing art therapy for his patients diagnosed with:

Dr. Carl Simonton is introducing art therapy used for Post traumatic stress disorder patient with psychological problems. Art therapy is a form of expressive therapy that uses the creative process of making art to improve a person’s physical, mental, and emotional well-being. Art therapy stands in contrast with other kinds of creative or expressive arts therapies that use dance, music or drama. ... However, the potential healing power of art therapy has not been thoroughly studied in certain patients, such as trauma victims with disorders such as PTSD. Post traumatic stress disorder

If the experiment was perfomed more then once and you get the same results