Insurance companies even refused to pay for most of it, due to lack of efficacy of most talk therapy. (greensmoothiegirl.com)
Twelve percent withdrew from the study for lack of efficacy. (sciencedaily.com)
While of obvious concern to our profession, product lack of efficacy did not emerge as a major contributing factor to heartworm incidence, in the opinion of veterinarians participating in the survey. (heartwormsociety.org)