Julvez J, Alvarez-Pedrerol M, Rebagliato M, Murcia M, Forns J, Garcia-Esteban R, Lertxundi N, Espada M, Tardon A, Riano Galan I, Sunyer J. Thyroxine levels during pregnancy in healthy women and early child neurodevelopment. Epidemiology. 2013 Jan;24(1):150-7. doi: 10.1097/EDE.0b013e318276ccd3