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Baynes JW, Dominiczak MH

answered Feb 17, 2021 at 15:26 $\endgroup$ 0 $\begingroup$ you just need to remember 1 of them, conCAVE, it is already in the word it is a cave hence the shape :-) answered Mar 29, 2021 at 9:20 $\endgroup$ 1 $\begingroup$ For consistency and coherence between curve shapes in a $(x,y)$ plane and the shape of the surface of lenses, it is better to relate the terms with the sign of the curvature $\partial^2 y/\partial x^2$: concave = negative curvature: $\partial^2 y/\partial x^2 0$ (thus: upward curve or domed surface) concAve negAtive conveX $+$ (rotated X) And when you look at a surface, the equivalent of the y-axis is the axis of your gaze, oriented away from you

however, most results were obtained via single-center observational and retrospective studies and lack information on confounding factors, such as duration of PPI exposure, antibiotic intake, and dietary patterns

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