Relationship between green space near schools with physical activity and body mass index in portuguese adolescents by Juliana Melo, Ana Isabel Ribeiro, Andreia Isabel Pizarro, Maria Paula Santos

“…UGS number and greenness amount were measured using network buffers by 300, 500, 1000 and 1500 meters around each school, through geographic information system and normalized difference vegetation index (NDVI), respectively. …”
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