Rheumatoid arthritis (RA) causes premature mortality, disability and compromised quality of life in the industrialized and developing world (1). Rheumatoid arthritis is a systemic inflammatory disease which manifests itself in multiple joints of the body.
A baritone is the most common type of male voice whose range lies midway between the high tenor voice and the low bass voice. In comedic operas, he is often the leader of the funny business, but he can also be the hero, who sacrifices himself for the tenor or soprano, or the villain.
Most Baritone/bass men can sing down to E2 which is 82 Hz, and a great many basses can sing two octaves below middle C, which is 65 Hz. Most men with low speaking voices are producing fundmentals in the 100 Hz range, and the booming professionals with radio voices can can easily speak in the 60-80 Hz range.