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The COVID-19 pandemic has highlighted existing gaps in school-based mental health services and created new and urgent needs to address student mental health. Evidence from early in the pandemic already suggests that preexisting educational and mental health disparities have increased under the stress of the current health crisis. School mental health professionals are essential to help address anxiety, to promote social adjustment in the 'new normal', and to address trauma, grief, and loss. Schools will also need to creatively support teachers durin

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Signal amplification is very important for electrochemical immunoassays. We report an enzyme-free electrochemical immunosensor based on an electrochemical-chemical-chemical (ECC) redox cycle advanced (RCA) signal amplification strategy for the ultrasensitive detection of Carcinoembryonic antigen (CEA). In this scheme, CeO2/Au NPs@SiO2 is connected with ferrocene as the redox indicator, and the detection buffer is composed of the reducing agent hydroquinone (HQ) and tris(2-carboxyethyl) phosphine (TCEP). First, ferrocenecarboxylic acid (Fc