Impaired mental processing speed, attention and alterations in visuo-spatial and motor coordination seem main contributors to impaired driving ability in patients with MHE. Increased serum 3-nitrotyrosine is associated with impaired driving ability.

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Llano-Ferro (2009) proposes a solution to avoid "significant errors" when the Weighted Average Cost of Capital (WACC) "obtained by the standard formula leads to significant errors in Net Present Value of the Firm calculations; particularly in those that apply to perpetual cash flow series". In this paper we show that there are not "significant errors" but a wrong use of the formula and improper calculations of values.The Weighted Average Cost of Capital (WACC) is used in finance for several applications, including Capital Budgeting analysis, EVA® calculations, and firm valuation. WACC obtained by the standard formula leads to significant errors in Net Present Value of the Firm calculations; particularly in those that apply perpetual cash flow series. The present paper identifies the problem, and provides alternative, and accurate formulas to obtain WACC for Firm Valuation calculations.

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