Some psychiatrists gain additional training and experience within the field of psychiatry. The specialties that have developed include child and adolescent psychiatry, psychiatry of old age, forensic psychiatry (concerned with legal, compensation and criminal cases), psychoanalysis and psychotherapy. Psychiatrists also act as consultants in drug and alcohol programs and to community services. Within hospitals they are commonly involved in liaison with other areas of medicine and surgery, for example as consultants to pain clinics.