United States National Science Board (2016). Research and development: National trends and international comparisons. In Science and Engineering Indicators. Arlington, VA: National Science Foundation. chapter 4. https://www.nsf.gov/statistics/2016/nsb20161/uploads/1/7/chapter-4.pdf.
World Health Organization (2018). Global Health Observatory (GHO) Data: Mortality and Global Health Estimates. http://www.who.int/gho/mortality_burden_disease/en/.
Yesson, C., Brewer, P.W., Sutton, T., Caithness, N., Pahwa, J.S., Burgess, M. et al. (2007). How global is the global biodiversity information facility? PLoS ONE 2(11), e1124. https://doi.org/10.1371/journal. pone.0001124.