I did a search in PubMed with these search terms (career mobility OR clinical ladders) AND (nursing staff hospital) and retrieved these references:

Adeniran RK, Bhattacharya A, Adeniran AA. Professional excellence and career advancement in nursing: a conceptual framework for clinical leadership development. Nurs Adm Q. 2012 Jan-Mar;36(1):41-51. doi:

Beglinger JE, Hauge B, Krause S, Ziebarth L. Shaping future nurse leaders through shared governance. Nurs Clin North Am. 2011 Mar;46(1):129-35. doi: 10.1016/j.cnur.2010.10.003. Epub 2010 Dec. 17.

Adeniran RK1, Bhattacharya A, Adeniran AA. Professional excellence and career advancement in nursing: a conceptual framework for clinical leadership development. Nurs Adm Q. 2012 Jan-Mar;36(1):41-51. doi: 10.1097/NAQ.0b013e31823b0fec.