In the description for Q2 at https://www.synapse.org/#!Synapse:syn21849255/wiki/602406 it says that: ?The prediction window (hospitalization within 21 days) starts at the first available positive test result in the measurement table.? However in the github link?s README section (https://github.com/Sage-Bionetworks-Challenges/ehr-dream-challenges/tree/master/examples/covid19-question-2) it says ?The goal of this continuous benchmarking project is to develop models that take as input the electronic health records (EHRs) of a patient and outputs the probability of a COVID-19-positive patient to be hospitalized within 21 day after his/her recent COVID-measurement.? Does the prediction window start from the first available positive test result or the last one? Thank you.