Atrioventricular Block

• Azienda Ospedaliero-Universitaria di Ferrara — Ferrara, FE, Italy
• Ospedale San Donato — Arezzo, Italy
• Azienda Ospedaliero-Universitaria S.Orsola-Malpighi Bologna — Bologna, Italy
• spedale Maggiore di Bologna — Bologna, Italy

• American Heart of Poland — Dąbrowa Górnicza, Poland
• American Heart of Poland — Mielec, Poland

Not specified

• Xijing Hospital, The First Affiliated Hospital of Air Force Medical University — Xi'an, Shaanxi, China

Not specified

• Tver State Medical University Clinical Center — Tver', Tver Oblast, Russia

• Fu Wai Hospital — Beijing, Beijing Municipality, China
• Peking University First Hospital — Beijing, Beijing Municipality, China

• National Taiwan University Hospital — Taipei, Taiwan

• Wonju Severance Christian Hospital — Wŏnju, Gangwon-do, South Korea
• Samsung Medical Center — Seoul, South Korea
• Samsung Changwon Hospital — Changwon, South Korea
• Veterans Health Service Medical Center — Seoul, South Korea

• The First Affiliated Hospital with Nanjing Medical University — Nanjing, Jiangsu, China