IGF1 and obstructive sleep apnea syndrome: Whitman and Myers [70] also recommended a repeat polysomnogram at 3–6 months after the initiation of GH in patients with PWS previously diagnosed and treated for OSA as well as regular screening with the Chervin sleep questionnaire (questions 1–6), examination of the oropharynx for tonsillar hypertrophy and monitoring of IGF-1 levels during the entirety of GH therapy.