You tried going to https://studiolab.ide.tudelft.nl/studiolab/persuasivegamedesign/studiolab/persuasivegamedesign/2013/11/21/nextlevel-gamedesign-principles-for-effective-e-health-based-mental-healthcare-therapy/onet.pl
, and it doesn't exist. All is not lost! You can search for what you're looking for.