At first we thought there might be a problem using them together but we tested it and it turned out they worked just fine together.
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I'll message her and ask, Lisa - she hasn't been on the site for a few months.
Ok I just heard back from her and while she's not totally sure (her son had a fever and she was up with him so her temps were weird) it was a 2 1/2 to 3 day cutoff, she thinks. Hope this helps!