The Reference style for the "Games for Health Journal" is as follow:
REFERENCES
A complete list of all cited references must be presented at the end of the manuscript. All supplied references must be cited in text as superscripted numbers in the order of citation, outside any punctuation, and without parentheses.
Journal:
Parisod H, Pakarinen A, Kauhanen L, et al. Promoting children’s health with digital games: a review of reviews. Games Health J 2014; 3:145-156.
Book:
Beale IL. Video Games for Health Journal: Principles and Strategies for Design and Evaluation (Public Health in the 21st Century). Hauppauge NY; Nova Science Publishers, Inc.; 2011.
If it is necessary to cite an abstract, this should be so designated. Authors are responsible for the accuracy of the reference and are reminded that inaccurate references are highly frustrating to the reader, the cited author, and indexing services. Abbreviations of journal titles should follow Medline.
Reference citations are not permitted in the abstract of any paper.
It seems that it is a Vancouver style of referencing, which is available in mendeley. So, you can go with that.