1. Early detection of pregnancy with transvaginal ultrasound;Fossum;Fertil Steril,1988
2. The Clinical Marker hCG;Hussa,1987
3. Polypeptide nicks cause erroneous results in assays of human chorionic gonadotropin free β-subunit;Kardana;Clin Chem,1992
4. Free human chorionic gonadotropin β subunit in gonadal and nongonadal neoplasms;Marcillac;Cancer Res,1992
5. β-hCG vs intact hCG assays in the detection of trophoblastic disease;Rinker;Clin Chem,1989