In 1987, Lovaas published the study, "Behavioral treatment and normal educational and intellectual functioning in young autistic children". The experimental group in this study received up to 40 hours per week in a 1:1 teaching setting at a table using errorless discrete trial training (DTT). The treatment is done at home with parents involved in every aspect of treatment, and the curriculum is highly individualized with a heavy emphasis on teaching eye contact, fine and gross motor imitation, and language. ABA principles were used to motivate learning and reduce non-desired behaviors. The outcome of this study indicated 47% of the experimental group (9/19) went on to lose their autism diagnosis and were described as indistinguishable from their typical adolescent peers. This included passing regular education without assistance, making and maintaining friends, and becoming self-sufficient as adults. These gains were maintained as reported in the 1993 study, "Long-term outcome for children with autism who received early intensive behavioral treatment". Lovaas’ work went on to be recognized by the US Surgeon General in 1999, and his research were replicated in university and private settings. The "Lovaas Method" went on to become known as early intensive behavioral intervention (EIBI), or 30 to 40 hours per week of DTT.