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.
The vocal tenor clef is used in vocal music for the male tenor voice part to indicate that the tenor voice actually sounds an octave lower that where it is notated in the normal treble clef. The vocal tenor clef should not be confused with the C clef that is also named tenor clef. In the past, the C clef known as the tenor clef was used for the tenor voice and is still used for other instruments in the same range such as the trombone, the cello, and the bassoon.