Fig. 1.

Flow chart of excluded and included patients. In total, 213 patients with suspected SFN were identified originally. The numbers of patients excluded and the reasons for exclusion are noted in the figure. Ultimately, 29 patients judged to have an idiopathic SFN were included. The proportion of idiopathic SFN using the basic level of investigation/screening was 25% [33/133 (33=29 included patients plus 4 patients who declined participation in the genetic study, and 133=88 in exclusion group A plus 12 in exclusion group B plus 33)]. ^*Exclusion group A, ^†Exclusion group B. SFN: small fiber neuropathy.