1. Yan’an Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, China (mainland)
2. Fuwai Yunnan Cardiovascular Hospital, Kunming Medical University, Kunming, Yunnan, China (mainland)
3. The First People’s Hospital of Yunnan Province, Kunming, Yunnan, China (mainland)
4. Department of Thoracic Surgery, The People’s Hospital of Chuxiong Yi Autonomous Prefecture, Chuxiong, Yunnan, China (mainland)
5. Department II of Hepatobillary Surgery, The People’s Hospital of Chuxiong Yi Autonomous Prefecture, Chuxiong, Yunnan, China (mainland)