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.
Tenor is higher pitched than the baritone. An analogy might be a trumpet versus a trombone. The clarion nature of the trumpet may well account for the fact that the most famous singers in opera are tenors - Carusso, Bjerling, Domingo and Pavorotti, for example.