Multi-entity biomarker

Also known as complex biomarker.

Single-component multi-entity biomarker

`biomarker_index`	`component_index`	`entity_index`	`assessed_biomarker_entity`
1	1	1	glycan A
1	1	2	protein X
1	2	1	some DNA
1	3	1	some RNA

In this example, component 1 is a glycoprotein, component 2 is a DNA molecule, and component 3 is an RNA molecule.

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