[Top] [Abstract] [Introduction] [Methods] [Results] [Discussion]           [Fig 1] [Fig 2] [Fig 3] [Fig 4]
[Equation] [Eq 1] [Eq 2] [Eq 3] [Eq 4] [Eq 5] [Eq 6] [Eq 7] [Eq 8] [Eq 9] [Eq 10] [Eq 11] [Eq 12] [Eq 13] [Eq 14] [Eq 15] [Eq 16] [Eq 17] [Eq 18] [Eq 19] [Eq 20]