Statistical analysis
All values are expressed as mean ± S.E.M. One-way ANOVA, followed by
Dunnett’s test, or Student’s unpaired t -test were used to
evaluate differences between three or more groups or between two groups,
respectively. Mac statistical analysis Ver.3.0 software (Esumi Co.,
Ltd., Tokyo, Japan) was used for the statistical analyses. Differences
were considered to be significant when P < 0.05.