In what way did Hippocrates influence the field of medicine that can be seen today?

Hippocrates invented tools that doctors still use today.
Doctors take an oath to follow a certain set of rules similar to one created by Hippocrates.
Modern hospitals are based on Greek hospitals started by Hippocrates.
Hippocrates discovered many of the medicines that doctors use today to treat illnesses.

Doctors take an oath to follow a certain set of rules similar to one created by Hippocrates.