Several IDC APIs, specifically /cohorts/manifest/preview, /cohorts/manifest/{cohort_id}, /cohorts/query/preview, /cohorts/query/{cohort_id}, and /dicomMetadata, ar_e paged. That is, several calls of the API may be required to return all the data resulting from such a query. Each accepts a _page_size query parameter that is the maximum number of objects that the client wants the server to return. The returned data from each of these APIs includes a next_page value. next_page is null if there is no more data to be returned. If next_page is non-null, then more data is available.