RT Journal Article SR Electronic T1 The glial trees JF Medical Humanities JO J Med Humanit FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP e3 OP e3 DO 10.1136/medhum-2011-010135 VO 38 IS 1 A1 Emma Zimmerman YR 2012 UL http://mh.bmj.com/content/38/1/e3.abstract AB