 00000000).  The authors declare no conflict of interest.  $r_{00}{}^{0} = \left( {w_{s} + d_{g}} \right)^{0} + \left( {d - 0.0t_{s}} \right)^{0}$, $r_{00}{}^{0} = \left( {w_{s} + d_{g}} \right)^{0} + \left( {d + 0.0t_{s}} \right)^{0}$,  $r_{00}{}^{0} = 