Table S2 is a duplicate of Table S3. Please view the correct Table S2 here: http://www.plosone.org/corrections/pone.0011486.s003.cn.xls
Footnotes
Competing Interests: No competing interests declared.
Table S2 is a duplicate of Table S3. Please view the correct Table S2 here: http://www.plosone.org/corrections/pone.0011486.s003.cn.xls
Competing Interests: No competing interests declared.