Gascon M, Cirach M, Martinez D, Dadvand P, Valentin A, Plasencia A, Nieuwenhuijsen MJ. Normalized difference vegetation index (NDVI) as a marker of surrounding greenness in epidemiological studies: the case of Barcelona city. Urban For Urban Green. 2016 Sep;19:88-94. doi: 10.1016/j.ufug.2016.07.001
Williams LK, Pladevall-Vila M, Fendrick AM, Lafata JE, McMahon LF. Differences in the reporting of care-related patient injuries to existing reporting systems. Jt Comm J Qual Patient Saf. 2003 Sep;29(9):460-7.