Fig. 1: Flow chart describing the selection of the study population.

25(OH)D, 25-hydroxyvitamin D; DSPN, distal sensorimotor polyneuropathy; KORA, Cooperative Health Research in the Augsburg Region; MNSI, Michigan Neuropathy Screening Instrument.

25(OH)D, 25-hydroxyvitamin D; DSPN, distal sensorimotor polyneuropathy; KORA, Cooperative Health Research in the Augsburg Region; MNSI, Michigan Neuropathy Screening Instrument.