1. Deriving a practical framework for the evaluation of health apps
Philip Henson, Gary David, Karen Albright, John Torous 
The Lancet Digital Health 
Volume 1, Issue 2, Pages e52-e54 (June 2019)
DOI: /S (19)
Copyright © 2019 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license Terms and Conditions

2. Figure Pyramid for app evaluation framework
The Lancet Digital Health 2019 1, e52-e54DOI: ( /S (19) )
Copyright © 2019 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license Terms and Conditions