How to handle multiple diagnosis/drug_era/etc for one patient id in patient level prediction

@Christian_Reich

Thanks for clarifying the issue. I may use R if I can, with the help of atlas defining cohort, bur for now I’m stick with the python until I figure out how to define cohort with the person Id only. If you have a time, feel free to see my other questions Defining cohort with person id - #2 by Chris_Knoll that I’m struggling. I’m not using atlas cohort definition, but rather building a cohort out of sql import-export tab. This is a bit interesting question I think and helpful for other people if they understand my problem, since people can define a cohort by themselves and upload it on the atlas using import-export tab. Thank you Christian.