Comorbidity and smoking	Pts with RS (n=10)	Pts without RS (n=36)	P-value
Respiratory disease n (%)	1 (10)	2 (5.6)	p>0.05
Respiratory disease n (%)	3 (30)	10 (27.8)	p>0.05
IHD n (%)	2 (20)	4 (11.1)	p>0.05
Anemia n (%)	5 (50)	8 (22.2)	p>0.05