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  • Australian Twin Registry  - Not-for-profit group facilitating medical and scientific studies involving the participation of twins and their relatives.
  • Center for the Study of Multiple Birth  - Facilitates research, education, and public service devoted to twins and multiple births worldwide.
  • International Society for Twin Studies  - Worldwide scientific organization dedicated to furthering research and public education related to twins and twin births.
  • Multiple Births Canada Research  - Presents multiple birth research documents, resource links, and project information.
  • Netherlands Twin Register (NTR)  - Vrije Universiteit in Amsterdam initiative established for scientific research purposes. Aims to study the influence of genes and environment on the development of the brain, intelligence, and behavior.
 
 
 
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