[1] Univ Texas Hlth Sci Ctr Houston, Dept Internal Med, McGovern Med Sch, Houston, TX 77030 USA
[2] Univ Texas Hlth Sci Ctr Houston, Div Cardiovasc Med, Dept Internal Med, McGovern Med Sch, Houston, TX 77030 USA
[3] Univ Texas Hlth Sci Ctr Houston, Dept Pathol & Lab Med, McGovern Med Sch, Houston, TX 77030 USA