Hsu JJ, Chiang CH, Hsieh CC, Hsieh TT. Elevated second-trimester maternal serum inhibin A levels in Asian pregnancies with fetal down syndrome and other chromosomal abnormalities. Fetal Diagn Ther. 2003 Mar;18(2):105–10. doi: 10.1159/000068070. PMID: 12576745.