- Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan - Department of Cardiovascular Surgery, Sapporo Cardio Vascular Clinic, Sapporo, Hokkaido, Japan - Department of Cardiovascular Surgery, Hokkaido Ohno Memorial Hospital, Sapporo, Hokkaido, Japan - Department of Neural Regenerative Medicine, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Hokkaido, Japan 
Corresponding author. Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine, Minami 1 Nishi16, Chuo-ku, Sapporo, Hokkaido 060-8543, Japan. Tel: +81-11-6112111; e-mail: [email protected] (N. Yasuda). 
Received August 17, 2020
Received in revised form November 30, 2020
Accepted December 02, 2020
This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)