Commentary: Extending the boundaries of data collection by mail.
Perneger
T V
TV
Institute of Social and Preventive Medicine, University of Geneva,and Quality of Care Unit, Geneva University Hospitals, Geneva, Switzerland.
Etter
J F
JF
D015981:Epidemiologic Factors; D006509:Hepatitis B / Q000453:epidemiology; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D011177:Postal Service; D012463:Saliva / Q000821:virology; D016036:Seroepidemiologic Studies