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Sensitivity of (a) direct electrochemical immunoassay/dECIA and indirect competitive electrochemical immunoassay/icECIA (calculated/obtained from [100,101,102,103,104]); (b) sandwich electrochemical immunossay/sECIA with nanomaterial or enzyme label/sELECIA (calculated/ obtained from [106,107,108,109,110,137]).
