Threats to Internal Validity in Worksite Health Promotion Program Research: Common Problems and Possible Solutions

1991 ◽  
Vol 6 (2) ◽  
pp. 112-122 ◽  
Author(s):  
Karen M. Conrad ◽  
Kendon J. Conrad ◽  
Jacqueline Walcott-McQuigg
2002 ◽  
Vol 44 (8) ◽  
pp. 776-780 ◽  
Author(s):  
Alyssa B. Schultz ◽  
Chifung Lu ◽  
Tracey E. Barnett ◽  
Louis Tze-ching Yen ◽  
Timothy McDonald ◽  
...  

2007 ◽  
Vol 39 (Supplement) ◽  
pp. S194
Author(s):  
Sonja D. Stoffel ◽  
Ferdinand Groeben ◽  
Nico P. Pronk ◽  
Randall W. Dick ◽  
Klaus Boes

1990 ◽  
Vol 17 (4) ◽  
pp. 395-407 ◽  
Author(s):  
Kathryn Rost ◽  
Cathleen Connell ◽  
Kenneth Schechtman ◽  
Benico Barzilai ◽  
Edwin B. Fisher

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