Delayed Qulnldlne-lnduced Diarrhea after Five Years of Treatment

Communications to the Editor neous, the prevalence of MVP in the south ofSweden, 7.4 percent, is considered to be valid also for the county of Stockholm. Third, regarding how MVP was diagnosed in our patients, our description was obviously not sufficiently clear. Like Margaliot et al, we used echocardiography as the diagnostic method for detection of MVP Regarding Professor Cheng’s point that a cause-and-effect relationship between smoking and MVP should be established, we believe that this can be done in two ways: (1) by comparing the smoking habits of MVP patients with the smoking habits ofa large matched group of contemporary control subjects, stratified according to age and cigarette consumption in the same geographic area; and (2) by studying siblings who have never smoked and who have suffered familial spontaneous pneumothorax.