Future NP And PA Supply Implications

[westcoastgirl]

http://content.healthaffairs.org/cgi/content/full/21/5/174

specifically the article states:

"The growing presence of PAs and NPs in American society is due to a number of factors--primarily to demand for their services. The education process has accommodated this demand with a supply of providers who continue to find employment. Demand for their services will likely continue in the near future as they fill niches where physician services are in short supply and where their economic labor makes them desirable. The education pipeline suggests that a rise of PAs and a decline of NPs may produce output parity in the near future, but the overall effect will be a net increase of providers. These observations may have important implications for physician workforce projections. "

the article is dated 2002, is there a similar one anyone recommends that is more recent?