“…The mean time interval between onset of symptoms and diagnosis is 2–3 years ( 2 , 4 , 8 , 17 , 18 , 23 ). Most common symptoms are dyspnea ( 2 , 10 , 18 ) both in rest and during exertion ( 8 , 23 , 40 , 41 ), cough, stridor ( 18 , 42 ), hoarseness, and wheezing ( 8 , 10 , 18 , 43 , 44 ). Before establishing diagnosis, patients commonly receive an erroneous diagnosis of chronic obstructive pulmonary disease or asthma ( 10 , 24 , 45 ).…”