A case of refractory leg ulcers caused by micro‐arteriovenous fistula: Potential utility of ultrasonography in the diagnosis. Issue 10 (19th May 2022) - Miyagawa, Akihiro; Adachi, Takeya; Arakawa, Hiroki; Hamada, Mariko; Akiyama, Yoshinobu; Inazumi, Toyoko