Placental hormones during induced hypoglycaemia in pregnant women with insulin-dependent diabetes mellitus: evidence of an active role for placenta in hormonal counter-regulation. - Bjorklund,AO.; Adamson,UK.; Carlstrom,KA.; Hennen,G.; Igout,A.; Lins,PE.; Westgren,LM. (Br J Obstet Gynaecol, 1998)