Follow Up Studies: Design, Organisation and Analysis
Johnson, M.A. and Morley, R.
ARCHIVES OF DISEASE IN CHILDHOOD 1989 October; 64(10): 1394-1402
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Tyrer, P.; Seivewright, H.; Ferguson, B.; Johnson, T. (2003-08)BACKGROUND: The ethics of cold calling-visiting subjects at home without prior appointment agreed-in follow up research studies has received little attention although it is perceived to be quite common. We examined the ...
Balls, Michael (1994)
Schlesselman, James J. (1982)