Li, L.; Wei, X.; Geng, X.; Duan, Z.; Wang, X.; Li, P.; Wang, C.; Wei, L. Impairment of Chondrocyte Proliferation After Exposure of Young Murine Cartilage to an Aged Systemic Environment in a Heterochronic Parabiosis Model. Swiss Med Wkly 2018, 148, w14607.