[1] Univ Hosp Birmingham NHS Trust, Dept Thorac Surg, Birmingham, England
[2] Alexandria Univ Hosp, Fac Med, Dept Cardiothorac Surg, Alexandria, Egypt
[3] Worcestershire Royal Hosp NHS Trust, Dept Med Oncol, Worcester, England
[4] NHS Trust, Univ Hosp Birmingham, Dept Cellular Histopathol, Birmingham, England
[5] Univ Birmingham, Inst Immunol & Immunotherapy, Vincent Dr, Edgbaston B15 2TT, England