Any contract or agreement which creates or established the terms of a partnership, employment, or any other form of professional relationship with a physician licensed by the board to practice in this state, which includes any restriction to the right of such physician to also practice medicine in any geographic area for any period of time after the termination of such partnership, employment, or professional relationship shall be void and unenforceable with respect to said restriction; provided however, that nothing herein shall render void or unenforceable the remaining provision of any such contract or agreement.