INS and diabetes mellitus: Age, elevated VPT, elevated mean plantar pressure, diabetes duration, body weight, OHA therapy, insulin use, history of angiography, daily alcohol intake, flatfoot deformity, hallux valgus, oxford shoes, varicosis, dry skin, mediasclerosis, skeletal abnormalities, HbA1c, triglycerides, stage of peroneal nerve conduction velocity, diastolic blood pressure