All

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 E04 Surgical Procedures, Operative D013514 +
  E04.100 Cardiovascular Surgical Procedures D013504 +
   E04.100.376 Cardiac Surgical Procedures D006348 +
    E04.100.376.475 Heart Transplantation D016027 +
      E04.100.376.475.450 Heart-Lung Transplantation D016041 
 E04 Surgical Procedures, Operative D013514 +
  E04.928 Thoracic Surgical Procedures D019616 +
   E04.928.220 Cardiac Surgical Procedures D006348 +
    E04.928.220.390 Heart Transplantation D016027 +
      E04.928.220.390.450 Heart-Lung Transplantation D016041 
 E04 Surgical Procedures, Operative D013514 +
  E04.936 Transplantation D014180 +
   E04.936.450 Organ Transplantation D016377 +
    E04.936.450.475 Heart Transplantation D016027 +
      E04.936.450.475.450 Heart-Lung Transplantation D016041