On 12/31/16 the cancer registry at Sacred Heart Hospital had 18,000 analytic cases with a registry reference date of 1/1/94. 8000 of those cases had been diagnosed within the last 5 years. How many of eligible analytic cases diagnosed need to have had follow-up within the last year?
a. 0
b. 6,400
c. 7,200
d. 8,000
