CASP8 and endometriosis: Frequency distribution of the genotypes of polymorphisms FAS rs3740286 (A ˃ G), FAS rs4064 (C ˃ G), CASP8 rs13416436 (A ˃ T) and CASP8 rs2037815 (A ˃ G), in women with endometriosis and in the control group