1 Subjects: “...national nature reserve...”

2 Subjects: “...National Health and Examination Survey (NHANES)...”

3 Subjects: “...Chinese national scenic areas...”

4 Subjects: “...National Health Services...”

5 Subjects: “...Manu National Park...”

6 Subjects: “...national ambient air quality standards...”

7 Subjects: “...cross-national case study...”

8 Subjects: “...national parks...”

9 “... Development Goals (SDGs) set by the United Nations (UN). There are lots of challenges to developing modern...”

10 “... in socio-economic dimension, urbanization etc.), in the urban space particularly in developing nations...”