1. Pediatric Environmental Health Speciality Unit, Laboratory of Environmental and Human Health (A5), Department of Paediatrics, Institute of Biomedical Research, IMIB-Arrixaca, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.
2. Departamento de Métodos Cuantitativos e Informáticos. Universidad Politécnica de Cartagena, Cartagena, Spain.
3. Division of International Health, Mount Sinai School of Medicine, New York, NY.