earlier research

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1 Earlier research about smiling has produced mixed results.
2 The latter result was not found in earlier research .
3 This is consistent with earlier research on sources.
4 Earlier research has shown that mortality rates actually decline during a recession .
5 Two main discrepancies stand out between our study and this earlier research .
6 Kaptchuk has conducted earlier research on placebos.
7 Earlier research using rhesus monkeys helped scientists understand how the virus attacks cells.
8 The Space Shuttle booster motor is a derivative of this earlier research .
9 The findings of (de)VOICED also confirms earlier research .