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Abstract Background: Antibiotic-associated diarrhea (AAD) is a common adverse event of antimicrobial therapy. Probiotics have been investigated for the prevention of AAD, but the evidence remains heterogeneous and fragmented. We conducted an umbrella review and second-order meta-analysis to comprehensively evaluate the efficacy and safety of probiotics for AAD prevention.
This work demonstrates a full-color optical image combiner for augmented reality head-up displays. In this device, the angle of the incident light of the computer-generated image reflected by it can vary over a large range. It achieves improved performance by using a combination of polarization interference filters (PIFs), quarter-wave retarders (QWRs), and polarization volume holograms (PVHs). The details for an example design and its performance are presented.
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