1. Use of heterophilic antibody blocking agent (HBT) in reducing false-positive hCG results;Butler;Clin Chem,2001
2. False positive hCG;Butler;Obstet Gynecol,2002
3. False positive or phantom hCG result: a serious problem;Cole;Clin Lab Int,2001
4. Detection of hCG in trophoblastic disease. The USA hCG reference service experience;Cole;J Reprod Med,2002