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CORRECTION

There were some editorial errors in this article by Dr Guo and others (2005;81:526–9). The data for the second to last row in table 2 should have read for column T/T 7 (36.9 [not 2 (10.5)]; for column C/C 2 (10.5) [not 7 (36.9)]; for column T 24 (63.2) [not 14 (36.8)]; and for column C 14 (36.8) [not 24 (63.2)]. The data for the last row should have read for column T/T 15 (34.1) [not 2 (4.5)]; for column C/C 2 (4.5) [not 15 (34.1)]; for column T 57 (64.8) [not 31 (35.2)]; and for column C 31 (35.2) [not 57 (64.8)].