Retraction: Application of piezoelectric nanogenerator in medicine: bio-experiment and theoretical exploration

The article “Application of piezoelectric nanogenerator in medicine: bio-experiment and theoretical exploration” (doi: 10.3978/j.issn.2072-1439.2014.09.03) that appeared on page 1300-1306 of the September 2014 issue of the Journal of Thoracic Disease needs to be withdrawn for the authors’ reason. We are sorry for the inconvenience caused.