The ATC Classification includes the interface between the ATC 5th Concept Class and the RxNorm Ingredient Concept Class. While all 5 concept classes belonging to ATC have a level of separation of 1, the ATC 5th Concept Class and RxNorm Ingredient have a level of separation of 0, but it is treated as 1 for this use case.
Due to the high amount of records, used to determine the appropriate range based on row counts per level to supply the optional range argument for plot_atc_classification, where this function is called again and can be optionally filtered on a numeric range before plotting.
preview_atc_classification( conn, concept_class_obj, vocab_schema = "omop_vocabulary", verbose = TRUE, render_sql = TRUE, sleep_time = 1 )