How was Emil Theodor Kocher awarded the Noble Prize in Physiology or Medicine?

Name: Emil Theodor Kocher.
Country: Switzerland.
Date of Birth: 14 March 1854.
Died: 20 August 1915.
Education: University of Bern.
Subjects Of Study: Thyroid gland.
Known as: Developer of Thyroid surgery.
Noble Prize Year: Nobel Prize for Peace in 1909, for his work on the thyroid gland.