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For issues relating to arranging items into ordered levels.

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Database schema for a variable-level hierarchy with variable types?

The tricky part of representing this in a database is that there may be anywhere from 2-5 hierarchical "filters" to narrow down the health issue, then a hierarchy of questions to ask the patient. … The same filters and questions can be re-used in any level of the hierarchy. The questions must also be translated into several languages if dealing with a non-English speaking patient. …
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