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The umbilical cord pieces were collected at \u201cCentro Hospitalar da Cova da Beira\u201d (Covilh\u00e3, Portugal) from normal term pregnancies after vaginal delivery. According with the report of the Ethics Committee, the anonymity of the mothers\/newborns was assured. In addition, to use the umbilical cord samples, the informed consent of the donner mothers was settled.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"All listed authors have read the manuscript and approved its submission to <i>Environmental Science and Pollution Research<\/i>: Nadia Oliveira, Helena Marcelino, Regina Azevedo, and Ignacio Verde.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}