1. 2 × 2 kappa coefficients: measures of agreement or association?;Bloch;Biometrics,1989
2. Questionnaire development: 2. Validity and reliability;Del Greco;Can. Med. Assoc. J.,1987
3. Design and Analysis of Reliability Studies: The Statistical Evaluation of Measurement Errors;Dunn,1989
4. Design and Analysis of Reliability Studies: The Statistical Evaluation of Measurement Errors;Dunn,1989
5. Design and Analysis of Reliability Studies: The Statistical Evaluation of Measurement Errors;Dunn,1989