Table 1 Potential additional factors causing neuropathy in patients with DM and DSP: historical features.

Factor	n
Exposure to neurotoxic medications	7
(amiodarone, 3; colchicine, 2; platinum
chemotherapy, 2)
Alcohol abuse	6
B12 deficiency	4
(documented level <200 mg/dl prior
to onset of neuropathic symptoms)
End stage renal disease	4
Inflammatory bowel disease	3
(ulcerative colitis in 3, Crohn's disease in 1)
Rheumatoid arthritis	1
Total	25 (24%)