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“EBP creates an interesting predicament because the efficacy of NSOMEs has been questioned based both on empirical data and on the basic underlying assumptions for their use (Clark, 2003, 2005; Forrest, 2002; Kamhi, 2006; Lof, 2003).”
Lof and Watson wrote the above in their 2008 survey article (p. 393). As you read, they specifically listed five references as a base to their “NSOME” concerns and criticisms.
So, I zeroed-in on those five documents and read them very carefully....