Dr. Vance Mason and Ariel Zetina discuss her pregnancy during a checkup at Inner City Health Center in Denver, Colorado on March 15, 2017. Dr. Mason has been volunteering one day a week at ICHC for 16 years. Inner City Health Center was founded in 1983 and offers medical, dental, and mental and behavioral health services to the uninsured and underserved populace of Denver County and surrounding Colorado communities. Services are offered to patients based on a sliding scale, and 65% of the patient population is below 200% of the federal poverty level. ICHC serves more than 22,000 patients annually. / AFP PHOTO / Jason ConnollyJASON CONNOLLY/AFP/Getty Images