Competing interests
Headache, Pain
LS, HL and CQ are full-time employees of Eli Lily and Company. SY serves as associated editor of the Journal of Headache and Pain and as a member of the International Headache Society. MZ has no competing interests. JZ, LZ, DC, KS, GL, XY and SY declare receiving clinical research fees from Eli Lilly and Company for participating as investigators in the PERSIST study.