Confused regarding APA style

I'm doing a project for an online sociology course and it's the first time I've ever had to use APA. I've learned how to cite websites properly but trying to figure out how to properly site a study report from an online database has had me confused for days, even when I try using an online citation builder, and I would really appreciate some help.

For example, how would I cite this: https://www.ncbi.nlm.nih.gov/pubmed
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