Workers in this unit group provide professional medical, dental, veterinary and related services not performed by those classified elsewhere. Their functions include: diagnosing and treating, mainly by manipulative methods, disorders of bones, muscles, blood vessels and other tissues of the human body; relieving illness believed due to pressure upon nervous system at the spine by adjusting joints of the spine; promoting, and supervising implementation of, measures to restore or improve sanitary environmental conditions; writing specifications for and fitting artificial limbs, braces and other appliances for body deformities and disorders following prescription of physician; performing related tasks.