This paper is in the following e-collection/theme issue:

Games for Health 

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Works citing "Silence is Golden: Effect of Encouragement in Motivating the Weak Link in an Online Exercise Video Game"

Brandon C Irwin, Deborah L Feltz, Norbert L Kerr
J Med Internet Res 2013 (Jun 04); 15(6):e104 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2551):

(note that this is only a small subset of citations)

1. Feltz DL, Forlenza ST, Winn B, Kerr NL. Cyber Buddy Is Better than No Buddy: A Test of the Köhler Motivation Effect in Exergames. Games for Health Journal 2014;3(2):98 [CrossRef]
2. Hüffmeier J, Wessolowski K, van Randenborgh A, Bothin J, Schmid-Loertzer N, Hertel G. Social support from fellow group members triggers additional effort in groups. European Journal of Social Psychology 2014;44(4):287 [CrossRef]