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Assessment of reliability and validity of original questionnaire to evaluate knowledge of and attitudes towards extending professional powers of nurses and midwives with respect to independent prescription of certain drugs, writing out prescriptions, and referring for diagnostic tests – preliminary report
5. Feldt LS. A test of hypothesis that Cronbachs alpha or Kuder-Richardson coefficent 20 is same for 2 tests. Psychometrika. 1969;34(3):363.10.1007/BF02289364