In "Figure 3-1: Relationship between FHIR Measure and CQL Expression Script", the "Initial-population" should be changed to "initial-population" to match the code.

Same should also be changed in the sentence above Figure 3-1, "Snippet 3-13 and Snippet 3-14 demonstrate the use of the FHIR Measure resource and CQL in the definition of the "Initial-population"."