A recent GWAS study looked for SNPs associated with bipolar disorder. There were two groups of study participants, those who had bipolar disorder, and those who did not. Aside from this difference, the people in the groups were chosen to be as similar as possible with regards to things like ancestry, age, and presence of other diseases.
What type of GWAS study is described?
Multiple Choice
Cohort
Affected sibling pair
Homozygosity mapping
Case-control