Understanding the bias of mobile location data across spatial scales and over time: A comprehensive analysis of SafeGraph data in the United States.

Mobile location data has emerged as a valuable data source for studying human mobility patterns in various contexts, including virus spreading, urban planning, and hazard evacuation. However, these data are often anonymized overviews derived from a panel of traced mobile devices, and the representativeness of these panels is not well documented. Without a clear understanding of the data representativeness, the interpretations of research based on mobile location data may be questionable.

Influence of root canal fillings on longevity of direct and indirect restorations placed within the General Dental Services in England and Wales.

Aim: To consider the survival of restorations in root filled and non-root filled teeth.

Methods: A data set was established consisting of patients, 18 years or older. For each patient on the database with a tooth restored with a direct or indirect restoration with or without a root filling, the subsequent history of intervention on that tooth was consulted, and the next date of intervention, if any could be found in the data set, was obtained.

[Giant bronchogenic cyst in a newborn infant].

A 12 hour old newborn suffering from respiratory distress was found to have a well defined opaque mass in the right lung. The mass was well tolerated up the 33rd day of life when he developed acute respiratory distress, the upper respiratory tract being flooded with secretions. Chest X ray showed that the mass had disappeared and that there was a large cystic structure instead.