A nervous disposition has been linked with gastric ulcers (McClure et al. 1999) but the same association was not seen in another study (Vatistas et al. 1999a)(Jonssen 2006). | A nervous disposition has been linked with gastric ulcers (McClure et al. 1999) but the same association was not seen in another study (Vatistas et al. 1999a)(Jonssen 2006). |