dtrSurv v1.2 (Release date: 2021-05-04)
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Changes:

* Updated documentation and examples for dtrSurv to more clearly indicate
  stage nature of the response variables
* Added check to ensure that response variables (k+1:nDP) are zero if delta_k=1

dtrSurv v1.3 (Release date: 2022-03-18)
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Changes:

* Removed check to ensure that response variables (k+1:nDP) are zero if delta_k=1