NCBI's Database of Genotypes and Phenotypes: dbGaP. - Kimberly A. Tryka; Luning Hao; Anne Sturcke; Yumi Jin; Zhen Y. Wang; Lora Ziyabari; Moira Lee; Natalia Popova; Nataliya Sharopova; Masato Kimura; Michael Feolo (Nucleic Acids Res., 2014)