Chen, Xiaofeng, Chunlei Wang, Lei Teng, Yaohua Liu, Xin Chen, Guang Yang, Ligang Wang, et al. 2014. “Calcitriol Enhances 5-Aminolevulinic Acid-Induced Fluorescence and the Effect of Photodynamic Therapy in Human Glioma”. Acta Oncologica 53 (3):405-13. https://doi.org/10.3109/0284186X.2013.819993.