What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Cardiology Patient
An individual receiving medical attention for conditions related to the heart and its functioning.
Stress Test
A medical test that assesses how the heart works under physical stress, often involving exercise or medication that mimics exercise on the heart.
PET Scan
A diagnostic imaging test using a radioactive substance to view organs and tissues inside the body to detect diseases.
Metabolic Activity
The chemical processes occurring within a living organism in order to maintain life, which include anabolism and catabolism.
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