RT Journal Article SR Electronic T1 Self-assessment questions: The acute porphyrias JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP s41 OP s41 DO 10.7861/clinmedicine.12-6-s41 VO 12 IS Suppl 6 A1 David C Rees YR 2012 UL http://www.rcpjournals.org/content/12/Suppl_6/s41.abstract