- Correspondence to: He-ping Zheng, Guangdong Provincial Centers for Skin Diseases and STIs Control and Prevention, 10, Xian Lie Dong Heng Road, Guangzhou, 510500, P R China;
- Accepted April 14, 2003
- First published October 22, 2003.
Please note that there were errors in the published version of Table 2.
A corrected version is provided below
The errors are much regretted
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