It's self reported data in general, not specific to this case: http://www.sciencebrainwaves.com/the-dangers-of-self-report/ http://www.sciencebrainwaves.com/th

It's self reported data in general, not specific to this case: http://www.sciencebrainwaves.com/the-dangers-of-self-report/ http://www.sciencebrainwaves.com/the-dangers-of-self-report/