Proxy -- Voting trust

No proxy for shares of a professional service corporation shall be valid unless it shall be given to a qualified person. A voting trust with respect to shares of a professional service corporation shall not be valid unless all the trustees and beneficiaries thereof are qualified persons, except that a voting trust may be validly continued for a period of ten (10) months after the death of a deceased beneficiary or for a period of five (5) months after a beneficiary has become a disqualified person.