%0 Journal Article %T Determining sample size and length of follow-up for smartphone-based digital phenotyping studies %A Barnett,, Ian %A Torous,, John %A Reeder, Harrison, T %A Baker,, Justin %A Onnela,, Jukka-Pekka %J Journal of the American Medical Informatics Association %V 27 %N 12 %P 1844-1849 %@ 1067-5027 %D 2020-12-09 %I Oxford University Press %~ DeepDyve