Typographical error Hongxiu Han, The Third People's Hospital, Shanghai Jiaotong University School of Medicine 5 January 2012 The data 97.2% shown in the article should be 96.9%. We apologize for the oversight. Competing interests None declared
Typographical error
5 January 2012
The data 97.2% shown in the article should be 96.9%. We apologize for the oversight.
Competing interests
None declared