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Would you like to leave a message? accutane rx requirements Keim said the discrepancy between the Internet and milk bank samples is likely due to poor storing and shipping practices for the milk, some of which traveled 3-6 days to reach researchers. The study asked mothers in the online ads to choose their preferred shipping method. Twenty percent shipped their samples using freezer ice or gel packs to keep it frozen, while 62% percent used dry ice. "Some people, even though they used dry ice, didn't insulate it," Keim said. "If you put dry ice in a cardboard box it's going to dissipate pretty quickly."