Prabhakar, Sanjeev, et al. “PERIPHERAL NEUROPATHY AND ABNORMAL VISUAL EVOKED POTENTIALS IN STABLE PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE”. National Journal of Medical Research, vol. 5, no. 03, Sept. 2015, pp. 174-8, https://njmr.in/index.php/file/article/view/393.