1 Department of Internal Medicine, The University of New Mexico, Albuquerque, NM, United States.
2 Department of Molecular Physiology and Biophysics, Vanderbilt Genetics Institute, Vanderbilt University School of Medicine, Nashville, TN, United States.
3 Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, United States.
4 Key Laboratory of Resource Biology and Biotechnology in Western China, School of Life Sciences, Northwest University, Xi'an, China.