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Vessey and Howard ( 1993 ) presented data from epidemiological surveys in the United States of people who make mental health visits and who receive psychotherapy . In light of these findings , it is noteworthy that epidemiological surveys have consistently found an inverse relationship between level of education and prevalence of mental disorders in the population ( Robins & Regier , 1991 ) . The FGCS , through coordination of Federal agencies , exercises government-wide leadership in coordinating the planning and execution of geodetic surveys . Multidisciplinary studies , including geophyscial investigations ( paleomagnetism , geodetic surveys and reflection seismic studies ) , and geochemical and geochronological analyses are utilized to further constrain the geometry and evolution of mountain belts . One physician has the responsibility of performing the primary and secondary survey . She commented that " the actual survey work is relatively straight-forward and not too time consuming .