Table 1 Strategies for database search

Main database

MedLine (via PubMed)

http://www.ncbi.nlm.nih.gov/pubmed

(“Drinking Water" OR "Drinking Water" OR "Potable Water" OR “public water supply” OR “Water fluoridation” OR “Water supply”) AND (“Quality Control” OR “monitoring” OR “External Control” OR “Fluoride concentration” OR “Operational control”) AND (“Brazil” OR “Brazilian”)

Scopus

http://www.scopus.com/

( ( "Drinking Water" OR "Potable Water" OR "public water supply" OR "Water fluoridation" OR "Water supply") AND ( "Quality Control" OR "monitoring" OR "External Control" OR "Fluoride concentration") AND ( "Brazilian" OR "Brazil"))

LILACS

http://lilacs.bvsalud.org/

tw:( "Drinking Water" AND “External Control”) AND (instance:"regional") AND (db:("LILACS"))

tw:( “public water supply” AND “External Control”) AND (instance:"regional") AND (db:("LILACS"))

tw:(“Water fluoridation” AND “External Control”) AND (instance:"regional") AND (db:("LILACS"))

tw:(“Fluoretação da água” AND “Heterocontrole”) AND (instance:"regional") AND (db:("LILACS"))

tw:(“Fluoreto” AND “Água de abastecimento”) AND (instance:"regional") AND (db:("LILACS"))

tw:(“public water supply” AND “Fluoride content monitoring”) AND (instance:"regional") AND (db:("LILACS"))

tw:(“water for human consumption” AND “Fluoride”) AND (instance:"regional") AND (db:("LILACS"))

SciELO

http://www.scielo.org/

Drinking Water AND External Control

Public water supply AND External Control

Water fluoridation AND External Control

Fluoretação da água AND Heterocontrole

Fluoreto AND Água de abastecimento

Public water supply AND Fluoride content monitoring

Water for human consumption AND Fluoride

Embase

http://www.embase.com

('drinking water'/exp OR 'drinking water' OR 'potable water'/exp OR 'potable water' OR 'public water supply' OR 'water fluoridation'/exp OR 'water fluoridation' OR 'water supply'/exp OR 'water supply') AND ('quality control'/exp OR 'quality control' OR 'monitoring'/exp OR 'monitoring' OR 'external control' OR 'fluoride concentration') AND ('Brazilian'/exp OR 'Brazilian' OR 'brazil'/exp OR 'brazil')

Web Of Science

http://apps.webofknowledge.com/

((“Drinking Water" OR "Drinking Water" OR "Potable Water" OR “public water supply” OR “Water fluoridation” OR “Water supply”) AND (“Quality Control” OR “monitoring” OR “External Control” OR “Fluoride concentration” OR “Operational control”) AND (“Brazil” OR “Brazilian”))

Grey literature

OpenGrey

http://www.opengrey.eu/

("Water fluoridation” OR “public water supply”) AND (“External Control” OR “Quality Control”)

("Fluoridation" OR "Fluorides") AND ("Water Quality Control" OR "Water monitoring")

OpenThesis

http://www.openthesis.org/

("Fluoridation" OR "Fluorides") AND ("Water Quality Control" OR "Water monitoring")

("Water fluoridation” OR “public water supply”) AND (“External Control” OR “Quality Control”)

Open Access

Theses and Dissertations (OATD)

https://oatd.org/

("Fluoridation" OR "Fluorides") AND ("Water Quality Control" OR "Water monitoring")

("Water fluoridation” OR “public water supply”) AND (“External Control” OR “Quality Control”)