Nerve ultrasound in painful diabetic neuropathy: a pilot study of sural and tibial nerves. - Alkotami, Ahmed Sami; Elkholy, Saly Hasan; Elshamy, Ahmed Mohamed; Fadel, Wael Ahmed; Elseidy, Ehab Ahmed Shawky; Zhran, Aya Elsaid (Egyptian Journal of Neurology, Psychiatry & Neurosurgery, 2026)