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    <element id="nthi_AccretionOfOriginalIssueDiscount" name="AccretionOfOriginalIssueDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AmortizationOfDebtIssuanceCosts" name="AmortizationOfDebtIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_BaseRent" name="BaseRent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LeaseIncreasesPercentage" name="LeaseIncreasesPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_OperatingLeasesLiability" name="OperatingLeasesLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_RightOfUseAsset" name="RightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CashPaidForAmountsIncludedInMeasurementOfLeaseLiability" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_MeasurementDate" name="MeasurementDate" nillable="true" xbrli:periodType="duration" type="xbrli:dateItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_RiskfreeRate" name="RiskfreeRate" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_VolatilityRate" name="VolatilityRate" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsIssued" name="WarrantsIssued" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_FairValuePerWarrant" name="FairValuePerWarrant" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AggregateWarrantFairValue" name="AggregateWarrantFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ReleaseOfRestrictedStockUnits" name="ReleaseOfRestrictedStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromCommonStockAndWarrants" name="ProceedsFromCommonStockAndWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantDescription" name="WarrantDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PrivatePlacementDescription" name="PrivatePlacementDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PlacementAgentFees" name="PlacementAgentFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryServicesFees" name="AdvisoryServicesFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_GainOnSettlement" name="GainOnSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsCancelledWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsCancelledWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SharedBasedCompensationReversal" name="SharedBasedCompensationReversal" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_FairValueOfRestrictedStockGranted" name="FairValueOfRestrictedStockGranted" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_TreasuryStockTransaction" name="TreasuryStockTransaction" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsVested" name="WarrantsVested" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsExercised" name="WarrantsExercised" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromGrant" name="ProceedsFromGrant" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SubcontractorCosts" name="SubcontractorCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AllowableExpenses" name="AllowableExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_GrantIncome" name="GrantIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryFees" name="AdvisoryFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_InvestorRelations" name="InvestorRelations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ShareBasedCompensations" name="ShareBasedCompensations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
</schema>
