Key points are not available for this paper at this time.
Clinical Trials. Allocating Patients to Treatments. Measurement of Treatment Difference. The Design of a Sequential Trial Using the Boundaries Approach. The Analysis of a Sequential Trial. Alternative Approaches to the Design and Analysis of Sequential Clinical Trials. Prognostic Factors. The Comparison of More than Two Treatments. Implementation of Sequential Methods: Some Examples. References. Appendix. Index.
Prescott et al. (1983) studied this question.