1. Department of Human Genetics, Graduate School of Public Health; University of Pittsburgh; Pittsburgh Pennsylvania
2. Magee-Womens Research Institute and Foundation; Pittsburgh Pennsylvania
3. Department of Pathology, Children's Hospital of Philadelphia; The University of Pennsylvania; Philadelphia Pennsylvania
4. The Perelman School of Medicine; The University of Pennsylvania; Philadelphia Pennsylvania
5. Department of Pathology; University of Pittsburgh School of Medicine; Pittsburgh Pennsylvania
6. Trophoblastic Tumour Screening and Treatment Centre; Imperial College London, Charing Cross Hospital; London United Kingdom