1 Department of Cardiothoracic Surgery, Centro Hospitalar São João, Porto, Portugal, Alameda Prof. Hernâni Monteiro, 4200-319, Porto, Portugal. Electronic address: rita2ac@hotmail.com.
2 Department of Radiation Oncology, Centro Hospitalar São João, Porto, Portugal.
3 Department of Cardiothoracic Surgery, Centro Hospitalar São João, Porto, Portugal, Alameda Prof. Hernâni Monteiro, 4200-319, Porto, Portugal.
4 Department of Cardiothoracic Surgery, Centro Hospitalar Universitário de Lisboa Central-Hospital Santa Marta, Lisboa, Portugal.