Letter to the Editor
Thyrotropin reference values in the first trimester of pregnancy
Valores de referencia de tirotropina en el primer trimestre del embarazo
Javier Aller Granda
, Antonio Rabal Artal
Corresponding author
Servicio de Endocrinología y Nutrición, Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain
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