Fig. 1

Involved organ numbers per-patient at disease onset and at the last follow-up in 229 patients with RP. The involved organ numbers per-patient was 1.13 ± 0.03 at disease onset. At the onset, 201 patients had single manifestation and 28 patients had multiple manifestations. Cumulative numbers of involved organs at the last follow-up were 3.25 ± 0.10. Disease duration from the first symptom to the last follow-up was 4.69 ± 0.33 years