(a) Proceedings to determine whether a lawyer is personally incapable of practicing law shall be instituted and conducted in the same manner and upon the same procedure as disciplinary proceedings, except as otherwise set out in these Rules.

(b) In addition to, and without exclusion of, any other circumstances, cause to believe that a lawyer may be personally incapable of practicing law, justifying referral to the General Counsel, shall exist whenever information is received that such lawyer (1) has interposed successfully a defense of mental incompetence to secure abatement of, or to defeat an adverse determination in, disciplinary proceedings brought against him in any tribunal in any jurisdiction, (2) has defended, upon like grounds, a suit brought against him in any tribunal in any jurisdiction, (3) has been judicially declared incompetent, or (4) has been legally committed, otherwise than voluntarily, to an institution for the treatment of mental illness.