Survey Studies

• Enrollment Survey
  2002-Present
• Health and Wellbeing Questionnaire
  2010-Present

In-Person Studies

• Study of Air Pollution  in Twins
  February 2016-Present

At-home Studies

• Gene Expression and the Microbiome in Twins (GEMsTone)
  February 2018-Present
• Physical Activity in Twins follow-up study
  January 2018-Present