4. A member who ceases private practice or who permanently ceases to practise his profession shall, before the date on which he ceases to practise, obtain the insurance coverage described in paragraph 4 of section 7 for a period of at least 3 years except where, for the last 3 years preceding the permanent cessation of practice, he was not required to enroll in the insurance plan or would not have been required to had this Regulation been in force.