“…Moreover, various mechanisms (increasing physical activity (De Vries et al, 2013;Sugiyama et al, 2008;Richardson et al, 2013), increasing social contacts (De Vries et al, 2013;Maas et al, 2009;Sugiyama et al, 2008), increasing restoration/ stress reduction (De Vries et al, 2013;Roe et al, 2013), and decreasing environmental hazard exposure (Dadvand et al, 2012a)) have been suggested to explain the associations between green space and health (De Vries et al, 2013), but there is not a clear understanding of them yet (Nieuwenhuijsen et al, 2014;Hartig et al, 2014). Furthermore, little research has been conducted regarding types or characteristics of green spaces that may improve people's health (De Vries et al, 2013;Nieuwenhuijsen et al, 2014;Adevi and Grahn, 2011). Most of the existing studies have been performed in the northwest of Europe and the US, and the applicability of their conclusions to other parts of the world is uncertain (Nieuwenhuijsen et al, 2014).…”