1 Computational Biology and Bioinformatics Group, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
2 Department of Electrical and Computer Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA.
3 Department of Biomedical Informatics, Vanderbilt University School of Medicine, Nashville, TN 37203, USA ; Center for Quantitative Sciences, Vanderbilt University Medical Center, Nashville, TN 37232, USA ; Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA.
4 School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.