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Mendelian randomization (MR) study uses genetic variants as instrumental variables to explore the effects of exposures on outcomes, reducing potential biases caused by confounding and reverse causation 14

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Here are some early smoking mouth cancer symptoms that often get ignored: A mouth ulcer not healing for more than 2 weeks White or red patches inside the cheek, tongue, or gums Pain or burning while chewing or swallowing A lump or thickened area inside the mouth A feeling that something is stuck or rough in one spot Slight change in voice or discomfort while speaking None of these feel dramatic at first

BMC pregnancy and childbirth , 18 (1), 1-10

Why the Bladeless Design Matters Getting rid of the blade might sound like a small change, but it makes a big difference: No cleaning headaches No blade snapping during use