RT Journal Article
SR Electronic
T1 Exceptionally difficult
JF Drug and Therapeutics Bulletin
JO Drug Ther Bull
FD BMJ Publishing Group Ltd
SP 121
OP 121
DO 10.1136/dtb.2011.02.0064
VO 49
IS 11
YR 2011
UL http://dtb.bmj.com/content/49/11/121.abstract
AB