1 Department of Respiratory Diseases, Hospital Universitari Germans Trias i Pujol, Badalona, Spain; Department of Respiratory Diseases, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain. Electronic address: pmillanbilli@gmail.com.
2 Department of Respiratory Diseases, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain.
3 Department of Interventional Radiology, Hospital de la Santa Creu I Sant Pau, Barcelona, Spain.