1. Xu TM (2015) New concept of physiologic anchorage control. APOS Tends Orthod 5:250–254
2. Chen S, Du FY, Chen G et al (2013) Clinical research of the effects of a new type XBT buccal tube on molar anchorage control. Chin J Orthod 20:26–30
3. Chen S, Chen G, Xu TM (2015) Clinical application of the PASS technique. J Clin Orthod 49:508–515
4. Su H (2012) Factors influencing the mesiodistal tipping of first molars in malocclusion patients. Dissertation, Peking University. Beijing
5. Bills DA, Handelman CS, BeGole EA (2005) Bimaxillary dentoalveolar protrusion: traits and orthodontic correction. Angle Orthod 75:333–339