Two general medical wards have combined into one unit, with an average of 40 patients. Five medical teams (each consisting of a resident, two interns, and four medical students) do rounds at the same time, twice a day. At the end of rounds, all charts are returned to the nursing station. Because the units were combined, the medical staff has complained to the HCMO Commander that the nurses are missing medication doses at the required time and that "stat" orders take far longer than before. What is the most likely cause of these complaints?