Using routine care (preventive checkups , The garden variety strep infection, Etc.) or Emergency care (or other big- ticket medical events, like crisis appendectomies). The first group is fairly easy;
A person with clinical depression will experience at least four signs of the disorder for at least two weeks.
1: Family members or significant others that reports and respond to interviews.
2: Members of the health care team.
3: Medical record information
4: The patient, through interview, observations, and physical examination
& 5: Scientific literature.
Your answer would be the liver
Hope this helps :)