<human>: Does the sentence "Other notable new vaccines of the period include those for measles (1962, John Franklin Enders of Children's Medical Center Boston, later refined by Maurice Hilleman at Merck), Rubella (1969, Hilleman, Merck) and mumps (1967, Hilleman, Merck)" answer the question "Who helped refine the measles vaccine?"

OPTIONS:
- yes
- no
<bot>: yes