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BACKGROUND Inadequate sun exposure and dietary vitamin D intake can result in vitamin D insufficiency. However, limited data are available on actual vitamin D status and predictors in healthy individuals in different regions and by season. METHODS We compared vitamin D status [25-hydroxyvitamin D; 25(OH)D] in people < 60 years of age using data from(More)
Objective: To determine the vitamin D status of middle-aged women living in the Norwegian arctic and its relationship with vitamin D intake and exposure to ultraviolet (UV) radiation. Design: Cross-sectional study. Subjects and setting: This study is based on measurements of 25-hydroxyvitamin D (25(OH)D) levels in a sub-sample of the Norwegian component of(More)
Vitamin D production in human skin occurs only when incident UV radiation exceeds a certain threshold. From simulations of UV irradiances worldwide and throughout the year, we have studied the dependency of the extent and duration of cutaneous vitamin D production in terms of latitude, time, total ozone, clouds, aerosols, surface reflectivity and altitude.(More)
BACKGROUND Patients with multiple sclerosis (MS) are more frequently born in spring when compared to autumn. Fluctuation of UV-light has been hypothesized to drive this phenomenon. AIM To assess the correlation between fluctuation of sunlight and birth season in persons with MS. METHODS For this record-linkage study, we collected from the international(More)
While many sensors now produce a plethora of data, some still produce an insufficient number of samples. This is true for the marine scientific community, because the theory of wave propagation in water dictates the use of acoustic frequencies for underwater imaging. In this paper we discuss reconstruction of 3D scenes using data from an acoustic imaging(More)
Atmospheric Chemistry and Physics Discussions This discussion paper is/has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP if available. Abstract A multi-platform field measurement campaign involving aircraft and balloons took place over West Africa between 26 July and 25 August(More)
Vitamin D production in human skin occurs only when incident UV radiation exceeds a certain threshold. From simulations of UV irradiances worldwide and throughout the year, we have studied the dependency of the extent and duration of cutaneous vitamin D production in terms of latitude, time, total ozone, clouds, aerosols, surface reflectivity and altitude.(More)
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