  function withdrawCollateral(
    address _asset,
    uint256 _amount,
    address _to,
    uint256 _minReceiveAmount
  ) external virtual {
      // ...
    require(withdrawAmount >= _minReceiveAmount, Errors.VT_WITHDRAW_AMOUNT_MISMATCH);
  }
    // Exchange stETH -> ETH via Curve
    uint256 receivedETHAmount = CurveswapAdapter.swapExactTokensForTokens(
      _addressesProvider,
      _addressesProvider.getAddress('STETH_ETH_POOL'),
      LIDO,
      ETH,
      yieldStETH,
      maxSlippage
    );
    function setMaxSlippage(uint256 _slippage) external onlyOperator {
        maxSlippage = _slippage;

        //@audit This action usually emit an event.
        emit SetMaxSlippage(msg.sender, slippage);
    }
