[1] Howard Univ, Coll Med, Surg Outcomes Res Ctr, Washington, DC USA
[2] Boston Univ, Coll Med, Psychiat, Boston, MA 02215 USA
[3] Univ Alabama Birmingham, Epidemiol, Birmingham, AL USA
[4] Fed Med Ctr, Internal Med, Abeokuta, Ogun State, Nigeria
[5] Howard Univ, Coll Med, Internal Med, Washington, DC USA