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In the second paragraph of the Introduction, the final two sentences were incorrect. The correct sentences are below. Finally, individuals with non-type O blood have decreased clearance of von Willebrand factor (vWF). Since FVIII circulates in plasma bound to vWF, an increase in plasma vWF is also associated with increased levels of FVIII.

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Growers and Dutch government have concluded a covenant in which they express the ambition to reduce the carbon footprint of greenhouse production in order to improve the energy neutrality of newly built greenhouses. Conditioned cultivation in (semi-)closed greenhouses is seen as one of the instruments to reach this goal. It is appointed in the covenant to arrive in 2011 at 700 ha and in 2020 at 2,500 ha semi-closed greenhouses. This paper describes the instruments used to monitor the results of conditioned cultivation in eight semi-closed greenhouses in practice. It addresses the monitoring process, the installations involved and highlights some of the measured data.