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  <xs:element id="esta_MadrynCreditAgreementTermB4Member" abstract="true" name="MadrynCreditAgreementTermB4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="esta_MadrynCreditAgreementTermAMember" abstract="true" name="MadrynCreditAgreementTermAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>
