If all of the outstanding shares of a professional corporation organized for the purpose of practicing medicine are held by an administrator, executor, personal representative, guardian, conservator or receiver of the estate of a former shareholder, or by a transferee who receives such shares by operation of law or by a judgment, such administrator, executor, personal representative, guardian, conservator, receiver or transferee may be a director, officer or shareholder of the professional corporation for a period of six months following receipt or transfer of such shares. [1997 c.774 § 18; 2003 c.576 § 317]