Funding
This study was originally funded by the US Office of Aerospace Medicine through the National Air Transportation Center of Excellence for Airliner Cabin Environment Research (ACER)/Research in the RITE, Cooperative Agreements 10-C-RITE-HU, 07-C-RITE-HU and 04-C-ACE-HU. Funding was also provided by National Institutes of Health grant ES000002.