Retraction to 'Low-dose human atrial natriuretic peptide for the prevention of postoperative cardiopulmonary complications in chronic obstructive pulmonary disease patients undergoing lung cancer surgery': [Eur J Cardiothorac Surg 2013; 44:98–103]. (14th June 2021) - Nojiri, Takashi; Inoue, Masayoshi; Maeda, Hajime; Takeuchi, Yukiyasu; Sawabata, Noriyoshi; Shintani, Yasushi; Yamamoto, Kazuhiro; Okumura, Meinoshin