If you agree to be in the study, you will be asked to fill out a questionnaire once every two years. The questionnaire will ask you questions about your health and family history. The investigator may ask you to donate a one-time blood specimen of approximately 3½ tablespoons, which can be done at your local doctor's office. The investigator may ask you if you are willing to provide the names and addresses of other family members who may be eligible to participate in the study. No visits to Mayo Clinic are required for your participation.
