Ethics statement
The studies involving humans were approved by The Regional Ethics Committee at The First Affiliated Hospital of Heilongjiang University of Traditional Chinese Medicine on December 15, 2011 (No: 2010HZYLL-010). The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study. Inclusion of identifiable human data. Written informed consent was obtained from the individual(s) for the publication of any potentially identifiable images or data included in this article.