Aldose reductase inhibitor ranirestat significantly improves nerve conduction velocity in diabetic polyneuropathy: A randomized double‐blind placebo‐controlled study in Japan oleh Kenji Sekiguchi, Nobuo Kohara, Masayuki Baba, Tetsuo Komori, Yutaka Naito, Tomihiro Imai, Jo Satoh, Yasuyuki Yamaguchi, Tatsuto Hamatani, the Ranirestat Group