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.
Mezzo-Soprano is the second highest female voice type. In a choir, a mezzo-soprano will usually sing along the sopranos and not the altos and will be given the title of Soprano II. When the sopranos split in half, she will sing the lower melody as her timbre is darker and tessitura lower than the sopranos.