"Employment" does not include service performed as a student nurse in the employ of a hospital or a nurses' training school by an individual who is enrolled and is regularly attending classes in a nurses' training school chartered or approved pursuant to state law; and service performed as an intern in the employ of a hospital by an individual who has completed a four years' course in a medical school chartered or approved pursuant to state law.
Ca. Unemp. Ins. Code § 645