“…Population-based incidence rates of Bell's palsy have been reported from areas within Europe [16,17,45,46], the United States [21,26,47], the Near East [20,25], South America [24] and Japan [27,28], While the number of population-based studies is limited, these rates are reasonably consistent and demon strate that the annual incidence of Bell's palsy in these populations appears to vary between 13 and 34 per 100,000 [47]. In addition to true differences between these populations, varying methods of case referral, ascertain ment, and diagnosis may account for the small differences noted between studies.…”