title: HPL measurements: relationships with maternal weight gain in twin pregnancy.
mesh_terms: D001835:Body Weight; D005260:Female; D006801:Humans; D007527:Isoenzymes / Q000032:analysis; D010920:Placenta / Q000201:enzymology; D010928:Placental Lactogen / Q000097:blood*; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D007527:Isoenzymes; D010928:Placental Lactogen