I am looking to download all the genotype calls for all samples available in GTEx from dbGap. Since some of the vcf files are quite large, I wanted to learn about their contents before downloading. The document here gives a brief idea about the contents: https://goo.gl/Y9iDbF
My question is: is there a single vcf file in dbGap that contains all of the genotype calls from all platforms/samples? Will I need to merge the multiple vcf files from the different platforms, to get the complete data? Any help or suggestions on the best way to proceed with this is highly appreciated.