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Table 1 Suggested search strategy

From: What is the effect of phasing out long-chain per- and polyfluoroalkyl substances on the concentrations of perfluoroalkyl acids and their precursors in the environment? A systematic review protocol

  Term 1 AND Term 2
  perfluor*   ((trend OR variation) NEAR (time OR temporal))
OR polyfluor* OR ((change OR increase OR decrease) NEAR/5 (level or concentration))
OR fluorotelomer* OR “time series”
OR PF?S OR ((snow OR ice OR sediment) NEAR (core OR column OR cap))
OR PF?A OR archive*
OR PFC OR “specimen bank”
OR PFT OR “long-term monitoring”
OR PFHxS OR ”repeated measurements”
OR FOSE OR historic*
  1. Search terms are connected with the Boolean operator AND, and words within each term is connected by OR. Truncation is denoted by *. Question mark is a wildcard that represents exactly one character.