Source: https://www.researchgate.net/profile/Hadeel-Halaweh/publication/282830597_Physical_Activity_and_Health-Related_Quality_of_Life_Among_Community_Dwelling_Elderly/links/5649d4ca08aef646e6d3086e/Physical-Activity-and-Health-Related-Quality-of-Life-Among-Community-Dwelling-Elderly.pdf