The theory hinges on evidence which is circumstantial and anecdotal. Misuse of anecdotal evidence is an informal fallacy. Despite many anecdotal reports of success, medical evidence is absent. Anecdotal evidence suggests expanding glaciers almost worldwide. Reliance on anecdotal evidence is often a key indicator of pseudoscientific practice. TIGHAR's research has produced a range of archaeological and anecdotal evidence supporting this hypothesis. Until recently this was based solely on anecdotal evidence. The Gerson Institute promotes the therapy by citing patient testimonials and other anecdotal evidence. Devic's disease was associated in the past with many systemic diseases, based on anecdotal evidence. Also, private conversations and anecdotal information often reveal conflicting views. He offers anecdotal and statistical illustrations for this slowdown. The information available is largely anecdotal and limited. This criticism primarily derived from anecdotal testimony in the battle-inexperienced 101st Airborne. Anecdotal sources suggest that she was purchased by him. This anecdotal report has not been confirmed.