You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((\ practice guidebook to (biostatistics OR (biostatistical OR statistical)) AND epidemiology.\ ) OR (\ practical guide to statistics AND epidemiology.\ ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ practice guidebook to (biostatistics OR (biostatistical OR statistical)) and epidemiology.\ ) OR (\ practical guide to statistics and epidemiology.\ ))~".
• Adding a wildcard symbol may retrieve word variants: ((\ practice guidebook to (biostatistics OR (biostatistical OR statistical)) and epidemiology.\ ) OR (\ practical guide to statistics and epidemiology.\ ))*.