can be found at: Progress in Physical Geography Additional services and information for http://ppg.sagepub.com/cgi/alerts Email Alerts: http://ppg.sagepub.com/subscriptions Subscriptions: http://www.sagepub.com/journalsReprints.nav Reprints: http://www.sagepub.com/journalsPermissions.nav Permissions: http://ppg.sagepub.com/cgi/content/refs/29/1/104 SAGE Journals Online and HighWire Press platforms): (this article cites 7 articles hosted on the Citations
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Paul Aplin (2005) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: