PenchanskyR and ThomasJW: The concept of access: Definition and relationship to consumer satisfaction. Med Care, 1981; 19(2):127–140.
2.
SagrestanoLM, ClayJ, FinermanR, GoochJ, and RapinoM: Transportation vulnerability as a barrier to service utilization for HIV-positive individuals. AIDS Care, 2013; 26(3):314–319.
3.
Summary of Travel Trends:. 2009. National Household Travel Survey: U.S. Department of Transportation, Federal Highway Administration, 2011.
4.
DasguptaS, VaughanAS, KramerMR, SanchezTH, and SullivanPS: Use of a Google map tool embedded in an internet survey instrument: Is it a valid and reliable alternative to geocoded address data?. JMIR Res Protoc, 2014; 3(2):e24.