Niveles de homocistena en pacientes con demencia

A sheet feeding mechanism comprising feeding sheets to an accumulating area. The accumulating area being at a first lateral plane and comprising spaced side rails at said first lateral plane. The accumulating area is between the side rails. The side rails are movable to a second lateral plane spaced from the first lateral plane. The distance between the side rails may be adjusted and after adjustment, the side rails are moved back to the first lateral plane.