title: At the request of the corresponding (first) author, the editors of Sleep are retracting the following paper and erratum: Guilleminault C, Quo S, Huynh NT, Li K. Orthodontic expansion treatment and adenotonsillectomy in the treatment of obstructive sleep apnea in prepubertal children. Sleep;31(7):953-957 and Erratum to Guilleminault C, Quo S, Huynh NT, Li K. Orthodontic expansion treatment and adenotonsillectomy in the treatment of obstructive sleep apnea in prepubertal children. Sleep;31(7):953-957, in Sleep 2009;32(1):6.