Erratum to: The effect of aging on the frequency, phenotype and cytokine production of human blood CD4 + CXCR5 + T follicular helper cells: comparison of aged and young subjects. Issue 1 (December 2015) - Zhou, Maohua; Zou, Ruqiong; Gan, Huiquan; Liang, Zhimei; Li, Fujun; Lin, Ting; Luo, Yanfei; Cai, Xiaoming; He, Fang; Shen, Erxia