Note: Please disregard confusing legend provided in Study tab of the study page which claims that study contains 552 subjects with genotypes - those totals are counts of subjects with all molecular data types, not just molecular genotypes.
More detailed representation of subject counts in molecular datasets (including genotypes) may be found in 'Molecular Data' tab at Common Fund (CF) Genotype-Tissue Expression Project (GTEx) dbGaP Study Accession: phs000424.v5.p1.