Inclusion criteria | Exclusion criteria |
---|---|
Women < 40 years old | Women who conceived the fetus using artificial methods including in-vitro fertilization or intrauterine insemination |
Aboriginal ancestry | Women carrying more than one fetus |
Pregnant with singleton | Surrogate mothers |
 | Women who suffer from severe chronic medical conditions including active cancer, severe infectious diseases including HIV, hepatitis B or C, or who are VDRL positive |