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Doctors have been aware of the dangers of immobility since 1940 - but airlines such as British Airways and Virgin Atlantic have only just started to highlight its dangers to the travelling public . Roberts et al. ( 1998 ) explored the risk of suicidal plans and ideation , depression , and factors such as self-esteem , loneliness , and pessimism among adolescents with a lifetime history of attempted suicide . This program is designed to familiarize departments with compliance responsibilities and requirements such as physical requirements for space , written material requirements , request for assistance at events and programs , evacuation plans , accommodations for students and staff , and available resources . Research into the differences in results between jurisdictions would help to discover whether there are any relationships between the results of assessments such as SAIP , TIMSS and IALS and factors such as curriculum , class size , per student expenditure , and socio-economic and linguistic distribution . The state governments , judiciaries , and environmental groups are well aware of the opportunities and challenges such development poses to the state 's economic and environmental interests . The nature of the exposure and factors such as possible pregnancy and drug resistant HIV strains must be considered before HIV postexposure prophylaxis ( PEP ) is recommended . services , including finance , search and music , and features such as online calendaring , e-mail and customized news-tracking , plus a suite of premium services at no additional charge , the new capabilities make it easier for people to stay in touch , find information , manage their lives and have fun online . It depends upon the individual 's degree and nature of hearing loss , and factors such as whether a person uses a hearing aid or can hear with volume amplification . Cisco recommends IP anti-spoofing techniques and features such as Unicast Reverse Path Forwarding ( uRPF ) to guard against spoofed IP packets . Overriding paint can confuse the painting system , which relies on the JComponent implementation of the paint method for correct painting , performance enhancements , and features such as double buffering . These regulations , guidelines , and laws dictate standard dimensions and features such as door widths , clear space for wheelchair mobility , countertop heights for sinks and kitchens , audible and visual signals , grab bars , switch and outlet height , and more .