Map showing the location of the screening sites in black (Nova Lima, Montes Claros and Bocaiúva (Montes Claros metropolitan area)) and of the central reading facility in grey (Belo Horizonte, Telehealth Centre, Hospital das Clínicas da Universidade Federal de Minas Gerais). Map showing the location of the screening sites in black (Nova Lima, Montes Claros and Bocaiúva (Montes Claros metropolitan area)) and of the central reading facility in grey (Belo Horizonte, Telehealth Centre, Hospital das Clínicas da Universidade Federal de Minas Gerais). The second reading centre is located at the Children’s National Health System, Washington, DC, USA. Bruno R Nascimento et al. Heart 2019;105:283-290 Copyright © BMJ Publishing Group Ltd & British Cardiovascular Society. All rights reserved.