objective: the aim of this study was to evaluate the clinical efficacy of an herbal medicine, piascledine, on the treatment of chronic periodontitis. materials and methods: twenty-four patients with chronic periodontitis participated in this interventional case control investigation. after initial screening the subjects were divided into case and control groups. clinical measurements including ...

background acetaminophen exposure might be associated with increasing risk of asthma prevalence and other atopic disorders over recent decades. the present study aimed to investigate the association between acetaminophen exposure and the risk of developing childhood asthma. methods a case - control study was undertaken between march and september 2010 in urmia district north west of iran. subje...

Software Conceptual Integrity has been considered a cardinal concern for design and development of software systems. But, except for verbal descriptions of desiderata, there were no formal tools to guarantee that conceptual integrity is attained. This paper proposes an axiomatic algebraic approach, based upon the assumption that the software system in each level of the system hierarchy is repre...