Retraction notice to "A SERS-based lateral flow assay biosensor for quantitative and ultrasensitive detection of interleukin-6 in unprocessed whole blood" [Biosens. Bioelectron. 141 (2019) 111432].

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the co-Editors in Chief and with the agreement of the authors, after a reader observed that Figure 3b had been partially duplicated with Figure 3a published in a previous publication by the same authors (Anal. Chem. (2017) 89:1163-1169) https://doi.org/10.1021/acs.analchem.6b03536.