Possible pathogenic role of Brain-Derived Neurotrophic Factor (BDNF) in glaucoma-like optic neuropathy in patients with intracranial tumours: Reply - Qu, Yuanzhen; Wang, Ya X.; Xu, Liang; Zhang, Liwei; Zhang, Junting; Zhang, Jianguo; Wang, Lina; Yang, Liu; Yang, Anchao; Wang, Jian; Jonas, Jost B. (Acta ophthalmologica, 2011)