Correction: Optimized protocol for double vaccine immunization against classical swine fever and porcine reproductive and respiratory syndrome.

Reference 1 Liu Z, Shan B, Ni C. Optimized protocol for double vaccine immunization against classical swine fever and porcine reproductive and respiratory syndrome. Ziyu Liu, Baiqiang Shan, Chao Ni and Shouhua Feng contributed equally to this work. [Extracted from the article]