Bar charts of the typical parameter values obtained from the final model in a leave-one-out method. The abscissa represents the study number dropped from the full data and the ordinate, the typical value of parameters. The left shadow bar represents parameters obtained from full data. Study 1: Faure et al. [12], 2: Penotti et al. [14], 3: Scambia et al. [9], 4: Upmalis et al. [10], 5: Quella et al. [8], 6: Crisafulli et al. [15], 7: Albertazzi et al. [7], 8: Knight et al. [11], 9: Van Patten et al. [13], 10: Campagnoli et al. [16], 11: Levis et al. [17], 12: Nahas et al. [18], 13: D'Anna et al. [19], 14: Ferrari [20], 15: Evans et al. [21], 16: Ye et al. [22]