3403540 RIAs ruptured intracranial aneurysms 56 1549606 RIA ruptured intracranial aneurysms 42 383440 RA ruptured intracranial aneurysm 6 1528502 RAs ruptured intracranial aneurysms 3 3699997 rICAs ruptured intracranial aneurysms 2