Chen, X.; Wang, C.; Teng, L.; Liu, Y.; Chen, X.; Yang, G.; Wang, L.; Liu, H.; Liu, Z.; Zhang, D. Calcitriol Enhances 5-Aminolevulinic Acid-Induced Fluorescence and the Effect of Photodynamic Therapy in Human Glioma. AO 2014, 53, 405-413.