What is the Adventist response to Justin Martyr?

Justin Martyr described Christians worshiping on Sunday twice in his first apology. > And on the day called Sunday, all who live in cities or in the country gather together to one place > > But Sunday is the day on which we all hold our common assembly. This document cannot be dated any later than 165 since the author died at 165 . In the great controversy Ellen G White claims that for **at least** the first 2 hundred years, Sunday worship was unheard of by Christians. > In the first centuries the true Sabbath had been kept by all Christians Ellen G White's and Justin Martyr's account of Christian history clearly contradict each other. How do Seventh-day Adventists respond to Justin Martyr's claims?