Given a list of findings, this function returns the minimum finding
Immunization findings can have associated contraindications and refusals.
To use them in the MAX_DATE function, precede the finding numbers with a
'C' or 'R'. For example, if finding 1 and finding 2 are immunizations and
we need to find the oldest contraindication date of the two immunizations
you would use:
date. This will be the oldest date. An example of a function finding
using the minimum date is:
This will be true if the minimum date of findings 1 and 3 is greater
than the minimum date of findings 2 and 4.