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In China, much more attention should be paid to the mental health condition of the elderly, especially for those with both parents alive. Moreover, the associated factors above should be considered to develop targeted health interventions.In this work we present a method for fabricating three dimensional, ultralight and flexible millimeter metamaterial units using a commercial household 3D printer. The method is low-cost, fast, eco-friendly and accessible. In particular, we use the Fused Deposition Modeling 3D printing technique and we
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