Systematic App Review

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My research is looking at the use of apps to support people who experience anxiety and chronic pain.

I want to carryout a systematic app review (like the one in the paper titled "Anxiety: There is an app for that. A systematic review of anxiety apps", Sucala, 2015) looking at how often anxiety is included in chronic pain apps.

The issue is, I don't know how to physically carryout the search. I have a Windows PC and I've accessed the Google Play store but that only showed 30 results which I know is not all of the results. Also, how do I extract the information - do I have to copy the app names and descriptions by hand into a database (that feel's like it is very susceptible to error).

I've tried looking online but I can't find anything about the practicality of doing the searches.

Thank you for your help and advice.

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