The function computes the estimate of the covariance of the test statistic of the score test proposed by Finkelstein (1986).
It is not to be called by the user.
Qiang Zhao and Jianguo Sun
Finkelstein, DM (1986), "A Proportional Hazards Model for Interval-censored Failure Time Data", Biometrics, 42: 845-854.
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