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(A) Correlation between the mean concentration levels found in sludge and serum (A1) and placenta (B1). Stimulants (Caffeine, Theobromine, and Theophylline) were excluded due to their recent intake by human individuals before sample collection. (B) Venn diagram representing all features (combining positive and negative ionization modes) in common between human matrices and sludge. Only features with available MS/MS data were considered.
