Received: 19 July 2019
Revised: 18 December 2019
Accepted: 17 January 2020
First Online: 17 February 2020
Compliance with ethical standards
: WEF is a founding partner in EnMed MicroAnalytics, a company that provides heavy metal screening for newborns and children. MSB has worked for ICF International as a paid consultant on the US EPA “IRIS Draft Toxicological Review of PCBs: Effects Other Than Cancer.” All other authors declare they have no actual or potential competing financial interests.