Karmali L. World of Warcraft Down to 7.7 million subscribers. IGN.com. July 26, 2013. .

Petry NM, O’Brien CP. Internet gaming disorder and the DSM-5. Addiction (Abingdon, England) 2013;108:1186-7.

Lanningham-Foster L, Foster RC, McCrady SK, Jensen TB, Mitre N, Levine JA. Activity-promoting video games and increased energy expenditure. Journal of Pediatrics 2009;154:819-23. Mitre N, Foster RC, Lanningham-Foster L, Levine JA. The energy expenditure of an activity-promoting video game compared to sedentary video games and TV watching. Journal of Pediatric Endocrinology and Metabolism 2011;24:689-95.