Published on in Vol 13 , No 4 (2011) :Oct-Dec
1 School of Library and Information Studies , University of Wisconsin-Madison , Madison , WI , US
2 Biostatistics and Medical Informatics , School of Medicine and Public Health , University of Wisconsin-Madison , Madison , WI , US
3 Institute for Healthcare Informatics , College of Information Science and Technology , Drexel University , Philadelphia , PA , US
4 Division of Specialized Information Services , National Library of Medicine , Bethesda , MD , US