sub-lists

Noob here ;)

First what is the best practice for lists that could be 10 items long, with 3-4 sublists under most of those? Should I do this in a list? or in checkboxes?

This is what I need to capture:

Heart disease(there are going to be other categories as well, like Lung Disease, etc. I am thinking of making these big categories Taxonomies)

Atrial Fibrillation

Coronary artery disease

- Angina

- Myocardial infarction

Congestive heart failure

etc.

So to recap: