- Correspondence to Shiguang Zhao, Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province 150001, The People's Republic of China;
- Changbin Shi, Section of Neurosurgery, Department of Surgery, The University of Chicago Medical Center and Pritzker School of Medicine, 5841 South Maryland Avenue (MC 3026), Chicago, IL 60637, USA;
- Received April 10, 2009
- Revised April 7, 2010
- Accepted April 12, 2010
- First published July 28, 2010.
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