1. Department of Geriatric Medicine and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan,
2. Hypertension Center, Steel Memorial Yawata Hospital, Kitakyushu, Japan,
3. Department of Internal Medicine, Shin-Oyama City Hospital, Tochigi, Japan,
4. MSD K.K., Japan, Tokyo, Japan, and
5. Merck & Co., Inc., Whitehouse Station, NJ, USA