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TLDR: Four methods.

1) PET/CT stimulation

2) Exposure to bright light

3) Exercise

4) Diet

> PET/CT stimulation

I didn't find the definition for PET/CT in the article. It sounds like PET/CT scans.

Yeah, I know the usual terminology is for a PET "scan", which sounds passive, so I'm not sure if they're doign something different here.

Another great exercise in confirming common sense.