From the Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.
Patient consent: The patient presented in this report gave his written informed consent for publication prior to his inclusion in the report.
Conflicts of Interest and Source of Funding: The authors have declared no conflicts of interest. No specific funding was received from any funding bodies to carry out the work described in this manuscript.
Correspondence: Takayuki Sumida, MD, PhD, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-city, Ibaraki 305-8575, Japan. E-mail: email@example.com.