Introduction: The objective of this retrospective cross-sectional study was to obtain epidemiological data from the charts of 297 patients with nasal polyposis who were operated on in a referral hospital in Mashhad and to determine the frequency of the presenting symptoms of nasal polyps.  Materials and Methods: The variables recorded included age, gender, the presence of asthma or allergic...

introduction: level of mothers’ literacy, pregnancy history of more than four times, residence in villages, lack of receiving intensive care during pregnancy, as well as inaccessibility to obstetric emergency services have been reported, in iran and the world, as major factors for maternal mortality. considering significance of identifying indirect causes of maternal mortalities, the present st...

well as serving to introduce the general reader to the basic life-processes of viruses, the most elementary of all living things. The arrangement of the book represents a trend away from classification by disease and towards a classification by the nature of the causative agent. Infections due to B-virus, the simian member of the herpes group, are now discussed with herpes simplex infections in...