[1] Springfield Family Med, Family & Prevent Med, Springfield, OR USA
[2] Univ Oklahoma, Hlth Sci Ctr, Dept Family & Prevent Med, Oklahoma City, OK USA
[3] Univ Oklahoma, Coll Med, Oklahoma City, OK 73190 USA
[4] Univ Oklahoma, Coll Med, Family & Prevent Med, Oklahoma City, OK 73190 USA