Due to an increasing awareness of the potential hazardousness of air pollutants, new laws, rules and guidelines have recently been implemented globally. In this respect, numerous studies have addressed traffic-related exposure to particulate matter using stationary technology so far. By contrast, only few studies used the advanced technology of mobile exposure analysis. The Mobile Air Quality Study (MAQS) addresses the issue of air pollutant exposure by combining advanced high-granularity spatial-temporal analysis with vehicle-mounted, person-mounted and roadside sensors. The MAQS-platform will be used by international collaborators in order 1) to assess air pollutant exposure in relation to road structure, 2) to assess air pollutant exposure in relation to traffic density, 3) to assess air pollutant exposure in relation to weather conditions, 4) to compare exposure within vehicles between front and back seat (children) positions, and 5) to evaluate "traffic zone"-exposure in relation to non-"traffic zone"-exposure.Primarily, the MAQS-platform will focus on particulate matter. With the establishment of advanced mobile analysis tools, it is planed to extend the analysis to other pollutants including NO2, SO2, nanoparticles and ozone.

Background: The oral leukoplakia and erythroplakia is one of the most common epithelial precursor lesions of the oral squamous cell carcinoma. Transformation rates are approximately 0.9-17% in 10 years for leukoplakia and in 14-50% for the erythroplakia. Despite the clinical relevance of these lesions, currently exists no detailed bibliometric analysis.Methods: The present study combines classical bibliometric tools with novel scientometric and visualizing techniques in order to analyse and categorize research in the field of leukoplakia and erythroplakia.Results: All studies related to leukoplakia and erythroplakia and listed in the ISI database since 1900 were identified by the use of defined search terms. The bibliometric analysis of the collected data shows a continuous increase in quantitative marker such as the number of publications and cooperation and qualitative markers, such as citations and H-index. The combination with density equalizing mapping revealed a distinct global structure of research and citing activity. Radar chart techniques were used to illustrate bi- and multilateral cooperations and institution research collaborations.Discussion: The present study demonstrates the first scientometric approach that visualizes research activities in the area of leukoplakia and erythroplakia. It provides data that can be used for geografical context and research networks.

The oral leukoplakia/erythroplakia is one of the most common epithelial precursor lesions of the oral squamous cell carcinoma. A clinical distinction is drawn between homogeneous and non-homogeneous as well as proliferative verrucous leukoplakia and erythroplakia. Due to the fact that the oral squamous cell carcinoma has a poor prognosis it is very important to decrease morbidity and mortality by systematic primary, secondary and tertiary prevention of the oral leukoplakia/erythroplakia. On the basis of histological classification systems the risk of malignant transformation can be evaluated, a defined therapy can be induced and the prognosis can be derived.