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Submitted on: 28 January 1998.
Revised on: 21 February 1998.
Accepted on: 31 March 1998.
___________________Journal of Nursing Regulation---ELSEVIER
Submitted on: 10 March 2010.
Revised on: 07 May 2010.
Accepted on: 13 June 2010.
___________________Journal of Nursing Regulation---ELSEVIER
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