The twin study at Helsinki University began in 1974, when the Older cohort studies were started. Later also Finntwin16 and Finntwin12 studies have been initiated. The follow-up study has continued to this day with three baseline projects. Several studies have also been completed to some smaller cohorts. Currently, we are cooperating with many Finnish and foreign researchers.

More than 550 articles from the study have been published in international journals. Additionally some 50 doctoral theses have been completed. Financial support is provided by University of Helsinki, Academy of Finland and National Institutes of Health. Some smaller fellowships have been received from many Finnish and foreign foundations. We also have cooperation with International Society for Twin Studies.

Prof. Jaakko Kaprio and Prof. Markku Koskenvuo have led the study since the 1980s. Professor Koskenvuo retired in June 2013. Most of the staff and all facilities are located at the University of Helsinki.

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