RT Journal Article SR Electronic T1 The Ins and Outs of Breathing – How We Learnt about the Body's Most Vital Function JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 183 OP 183 DO 10.7861/clinmedicine.12-2-183 VO 12 IS 2 A1 Humphrey Hodgson YR 2012 UL http://www.rcpjournals.org/content/12/2/183.abstract