Supply one or more terms to search for in the citation abstracts and submit the search. Search results will be determined by the Boolean logic used. Left to right rules apply.

For example, the following three search strategies may produce different results.

• # 1: fertility or marriage and childbearing may produce 211 matches;
  
• # 2: fertility and marriage and childbearing may produce 16 matches;
  
• # 3: fertility and marriage or childbearing may produce 205 matches).

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