The authors of paper “Two new species of Pestalotiopsis from Southern China” regret that the affiliation of Bin Zhang is incorrect. His affiliation is “Plant Protection and Quarantine Station, Guiyang City, 550081, People’s Republic of China”, thus the superscript of his name should be changed from “1” to “3”.

Background: Physical activity plays an important role in individual health at all stages of life. However, evidence is lacking regarding the level of moderate to vigorous physical activity (MVPA) and the related factors to insufficient physical activity (IPA). Methods: A sample of 1060 students aged 12–15 years from nine public junior high schools in China were invited to participate in this study. Physical activity was assessed by a modified version of the International Physical Activity Questionnaire. Logistic regression was used to assess the factors associated with IPA. Results: 30.1% boys and 43.0% girls in our sample did not engage in sufficient physical activity. Obesity (OR = 2.2, 95% CI: 1.5–2.9) and high socioeconomic status (SES) (OR = 2.4, 95% CI: 1.3–4.8) were positively associated with IPA, whereas male sex (OR = 0.7, 95% CI: 0.5–0.9), underweight status (OR = 0.5, 95% CI: 0.3–0.7), and high family support level for physical activity (OR = 0.7, 95% CI: 0.6–0.9) showed inverse associations. Age was not associated with IPA. Conclusions: IPA appears to be a considerable problem in this sample of Chinese youth. Effective interventions to increase physical activity are needed and may include improving family support level for physical activity, especially for girls, the obese and those with high SES.

To creat a preliminary database in accordance with McNamara's cephalometric analysis on lateral view of 3D CT cephalometric of the population from northeast China. Lateral 3D CT scans from 98 adults with Class I normal occlusal relationship from northeast China were collected. The coordinates of landmark points including the subspinale, supramental, upper incisor, pognion etc, were measured with the Frankfort plane and a vertical straight line though the nasion being the origin of reference. Measurements were taken with respect to effective maxillary and mandibular lengths, middle anterior and anterior face heights, and lower anterior length. The data were then analyzed with the data in McNamara's cephalometric analysis. Our lateral view of 3D CT based McNamara's cephalometric data indicate that subspinale locate antierior to the vertical line, but there is no significant difference between male and female. Statistical differences exist between male and female on effective maxillary length, effective mandibular length, 1/3 height of middle face, 1/3 height of lower face and lower face length. The present study built the first preliminary data of McNamara's cephalometric analysis on lateral view of 3D CT cephalometric of the population from northeast China. These data would be a useful reference for diagnosis and treatment plan of dental facial deformities, however it will take time to accumulate a large sample to establish a representative database.

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