[1] Sultan Qaboos Comprehens Canc Care & Res Ctr, Div Pulmonol, Muscat, Oman
[2] Sultan Qaboos Comprehens Canc Care & Res Ctr, Head & Neck & Thorac Program, Muscat, Oman
[3] Sultan Qaboos Comprehens Canc Care & Res Ctr, Div Pulmonol, Muscat 123, Oman