Erratum: Effects of Periodically Inhomogeneous Birefringence on Dark-Bright Vector Soliton Propagation and Interaction [Chin. Phys. Lett. 24 (2007) 462] Erratum: Effects of Periodically Inhomogeneous Birefringence on Dark-Bright Vector Soliton Propagation and Interaction [Chin. Phys. Lett. 24 (2007) 462]