Jon-Eric Van Leeuwen

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BACKGROUND Nitrate and atrazine are two chemicals that are heavily used in certain sectors of agriculture. They are suspected to be associated with the development of certain types of tumours. METHODS Existing data were obtained on the incidence of specific types of cancers, contamination of drinking water with atrazine and nitrate, and related(More)
Epidemiological and clinical trials have suggested that exercise is beneficial for patients with Parkinson's disease (PD). However, the underlying mechanisms and potential for disease modification are currently unknown. This review presents current findings from our laboratories in patients with PD and animal models. The data indicate that alterations in(More)
Gastropharyngeal reflux appears to be associated with various otolaryngological complaints. Cigarette smoking is known to affect adversely the defense mechanisms against reflux of acid gastric contents into the esophagus. To study the relationship between gastropharyngeal, as well as gastroesophageal, reflux and cigarette smoking, 15 subjects underwent(More)
BACKGROUND The role of gastropharyngeal reflux in patients with globus pharyngeus and hoarseness remains unclear. OBJECTIVE To evaluate patients with complaints of globus, hoarseness, or globus and hoarseness combined for the presence of gastropharyngeal and gastroesophageal reflux. DESIGN Prospective clinical cohort study of 3 groups of patients(More)
In Ontario, Canada, widespread resistance to ivermectin and fenbendazole, the only readily available ovine anthelmintics, has been documented, primarily in Haemonchus sp. In other parts of the world, closantel has been used to control such infections; however, the drug was not currently licensed for use in Canada and the USA. A randomized controlled trial(More)
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