Plot the DLT curve based on the EWOC proportional hazards model
dlt_curve_d1ph( mtd, rho, theta, min_dose, max_dose, shape, tau, distribution = "exponential", dose_set = NULL )
mtd: a numerical value indicating the true value of the parameter mtd.rho: a numerical value indicating the true value of the parameter rho.theta: a numerical value defining the proportion of expected patients to experience a medically unacceptable, dose-limiting toxicity (DLT) if administered the MTD.min_dose: a numerical value defining the lower bound of the support of the MTD.max_dose: a numerical value defining the upper bound of the support of the MTD.shape: a numerical value indicating the true value of the parameter shape. It is only necessary if 'distribution' = "weibull".tau: a numerical value defining the period of time for a possible toxicity be observed.distribution: a character establishing the distribution for the time of events. It can be defined as 'exponential' or 'weibull'.dose_set: a numerical vector of doses that probability of DLT will be calculated.