High Altitude Performance Hazardous Air Pollutant Hazardous Air Pollutants hazardous air pollution Harbor Assistance Program Hardware Allocation Panel Health Alliance Plan hepatic arterial phase High Altitude Platform histamine acid phosphate hospital-acquired pneumonia Host Access Protocol Housing Assistance Payments humanitarian assistance program haemagglutinin/protease Handicapped Aid Program haptoglobin Harald's Archiver Programm Hardness Assurance Plan Harmonization Array Pedestal Hawaii Assessment Program hazard analysis process heat-stable alkaline proteinase heavy atom perturber Helicopteros Aero Personal hepatic arterial-dominant phase heredopathia atactica polyneuritiformi… high alcohol preference High Altitude Program high available phosphorus