FREEDOM OF MOVEMENT FOR PERSONS - FREEDOM OF ESTABLISHMENT - FREEDOM TO PROVIDE SERVICES - WORKERS - DOCTORS AND DENTAL PRACTITIONERS - ACCESS TO THE PROFESSION - RESTRICTIONS JUSTIFIED ON GROUNDS OF PUBLIC HEALTH - PERMISSIBILITY - CONDITIONS AND LIMITS - PROHIBITION OF ENROLMENT IN PROFESSIONAL ASSOCIATION ON GROUND OF ENROLMENT IN ANOTHER MEMBER STATE - INCOMPATIBLE WITH THE TREATY ( EEC TREATY , ARTS 48 , 52 AND 59 )