Essential Hypertension

• The First Affiliated Hospital of Bengbu Medical College — Bengbu, Anhui, China
• Xuancheng People's Hospital — Xuancheng, Anhui, China
• Aerospace Central Hospital — Beijing, Beijing Municipality, China
• China-Japan Friendship Hospital — Beijing, Beijing Municipality, China

• Beijing Chaoyang Hospital, Capital Medical University — Beijing, Beijing Municipality, China

• Seoul National University Bundang Hospital — Seongnam, Bundang-gu, South Korea

• Beijing Hospital — Beijing, Beijing Municipality, China
• Beijing Anzhen Hospital, Capital Medical University — Beijing, Beijing Municipality, China
• Beijing Pinggu Hospital — Beijing, Beijing Municipality, China
• Affiliated Hospital of Chongqing Three Gorges Medical College — Chongqing, Chongqing Municipality, China

Not specified

• Hanyang University Seoul Hospital — Seoul, Seongdong-gu, South Korea

• Clinical Research Center, H PLUS Yangji Hospital — Seoul, Gwanakgu, South Korea

• Clinical Research Center, H PLUS Yangji Hospital — Seoul, Gwanakgu, South Korea

• CHA Gangnam Medical Center, CHA University — Seoul, Gangnam, South Korea

• Myongji Hospital — Goyang-si, Gyeonggi-do, South Korea