But the armpit effect has been difficult to demonstrate and some experts dismissed it as impossible.
Analyses can establish statistical relationships, but it has been difficult to demonstrate causality with any certainty.
However, this has been difficult to demonstrate for impulsive choice using existing measures of delay discounting.
Background: Preventing cardiovascular disease through community interventions makes theoretical sense but has been difficult to demonstrate.
Long-term complications, however, have been difficult to demonstrate because in most mice, the diabetes is transient and mild.
In spite of the wide dissemination of ACLS training, it has been difficult to demonstrate improved outcome following such training.
It has been difficult to demonstrate dose-dependent clinical effects of anti-allergic glucocorticosteroid drugs in allergic rhinitis.
Although the staff reported the groups were successful, it has been difficult to demonstrate any change in practice.
Factoring out the issue of conscious recollection, episodic memory, even at the behavioral level, has been difficult to demonstrate in non-human mammals.
Because the symptoms of lupus wax and wane and differ from person to person, it has been difficult to demonstrate in a clinical trial that a drug is effective against the disease.
However, even when the problem of conscious recollection in animals is factored out, episodic memory has been difficult to demonstrate in nonhuman mammals because it has not yet been possible to demonstrate an integrated memory for "what ,- where -and- when".
