def match_characteristics(other)
      chr = characteristics
      ochr = other.characteristics
      chr and ochr and chr.tissue_side == ochr.tissue_side and chr.tissue_site == ochr.tissue_site
    end
def match_characteristics(other)
      chr = characteristics
      ochr = other.characteristics
      chr and ochr and chr.tissue_side == ochr.tissue_side and chr.tissue_site == ochr.tissue_site
    end
def match_characteristics ( other ) chr = characteristics ochr = other . characteristics chr and ochr and chr . tissue_side == ochr . tissue_side and chr . tissue_site == ochr . tissue_site end
Returns whether this SpecimenRequirement characteristics matches the other SpecimenRequirement characteristics
 on the tissue site and tissue side.
Returns whether this SpecimenRequirement characteristics matches the other SpecimenRequirement characteristics on the tissue site and tissue side .