449
But in recent months , in cities from Boston to San Francisco , Phoenix to Denver , it has become common , to the alarm of doctors , paramedics and patients .
 cities from Boston to San Francisco , Phoenix to Denver, Boston, San Francisco, Phoenix, Denver, doctors , paramedics and patients
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 cities from Boston to San Francisco , Phoenix to Denver, Boston, San Francisco, Phoenix, Denver, doctors , paramedics and patients