Abstract :
The author makes the following corrections to the original article (see ibid., vol.53, no.9, p.2008-16, Sept. 2006). Due to miscommunication, the author has included Mansun Chan, Xing Zhang, and Yangyuan Wang as coauthors without their full consent. Jin He should be the sole author of the paper and is responsible for all the contents. He apologizes to the other coauthors whose names should not be associated with the paper.