updated intro and results summary
updated intro and results summary

Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study,Read-Lab-Confederation/nyc-subway-anthrax-study