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"What is needed now is an understanding of what is the threshold of professional nurse staff and complementary staff needed to achieve optimal outcomes, and how are these levels influenced by patient nursing acuity and the education, experience, organisation and work environment of the nurse workforce." --- I agree with you. Further, this study may be approached by Park's Optimized Nurse Staffing (Sweet Spot) Estimation Theory (Park, 2017): https://onlinelibrary.wiley.com/doi/full/10.1111/jan.13284. I am doing the research now.