RT Journal Article SR Electronic T1 Designer drugs: the biologic therapies JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 337 OP 343 DO 10.7861/clinmedicine.6-4-337 VO 6 IS 4 A2 David J Unsworth A1 Sarah Johnston YR 2006 UL http://www.rcpjournals.org/content/6/4/337.abstract AB