BACKGROUND Despite universal acceptance that smoking is harmful, a substantial number of adults continue to smoke. The development of potential reduced exposure products (more recently termed modified risk tobacco products) has been suggested as a way to reduce the risks of tobacco smoking. This trial is designed to investigate whether changes in toxicant exposure after switching from a commerc...

An important approach to reduce youth tobacco use is the adoption of regulations to prohibit tobacco product sale to individuals younger than 21 years, termed Tobacco 21. In the United States, close to 90% of current smokers started smoking before the age of 18 years, and 99% before age 26 years. Earlier age of tobacco use initiation is associated with lower rates of smoking cessation. Increasi...

Between January 1984 and January 1986, 131 porous-coated anatomic total hip replacements were performed in 119 consecutive patients. Of these, 100 patients (110 hips) who were alive at a minimum of 18 years after replacement were included in the study. The mean age of the patients at surgery was 48.4 years and that of surviving patients at the latest follow-up was 67.8 years. The mean duration ...

background: this study uses data of the global burden of diseases (gbd) study 2010 to report death, disability-adjusted life year (dalys), years of life lived with disability (ylds) and years of life lost due to premature mortality (ylls), attributed to suboptimal breastfeeding by age and gender during 1990 to 2010 in iran. materials and methods:the gbd assessments were used, together with esti...

HYPOTHESIS AND BACKGROUND Narrowing of the subacromial space has been implicated in several shoulder pathologies. However, the location of the minimum distance points during clinical testing has not been defined. We sought to measure the in vivo minimum distance and location of the minimum distance points on the acromion and proximal humerus during arm elevation. METHODS Eight healthy male su...

Background and Aim: Forensic age estimation of living individuals is a recent focus of scientific interest. Ultrasonographic examination of the hip is a safe and cost-effective method for assessment of skeletal age. Ultrasonography of the iliac bone apophysis and distal radial epiphysis is a useful and highly acceptable tool for bone age determination. The purpose of this study was to determine...

This paper examines the deep minimum of solar cycle 23 and its potential impact on climate change. In addition, a source region of the solar winds at solar activity minimum, especially in the solar cycle 23, the deepest during the last 500 years, has been studied. Solar activities have had notable effect on palaeoclimatic changes. Contemporary solar activity are so weak and hence expected to ca...