1 Department of Inter-Organ Communication Research, Niigata University Graduate School of Medical and Dental Science, 1-757 Asahimachi, Chuo-ku, Niigata, 951-8510, Japan. minakowa@med.niigata-u.ac.jp.
2 Departments of Nephrology and Hypertension, Fukushima Medical University, Fukushima, Japan.