Your professor may want you to search using the PICOT method.
What is PICO(T)

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Formulating a PICOT Question
Formulating a PICOT question is the first step in the process of carrying out a focused literature review and analysis of evidence.
PICOT is an acronym for the elements of the clinical question: a way of asking a clinical question that will help guide the search for evidence.
P = Patient population of interest: Identify patients by age, gender, ethnicity, disease or health problem
I = Intervention of interest (can also be issue of interest that has no comparison): Which intervention is worthwhile to use in practice? Which issue is studied (e.g. a treatment, diagnostic test, prognostic factor)?
C = Comparison of interest (you do not always have a comparison): What is the usual standard of care or current intervention used now in practice?
O = Outcome: What results do you wish to achieve or observe as a result of an intervention (e.g. change in patient behavior, physical findings, patient perception)?
T = Time (you do not always have a time frame): What amount of time is needed for an intervention to achieve an outcome (e.g. the amount of time needed to change quality of life or patient behavior)?
Tips: Try to define your topic using the acronym PICOT.
Thinks about: What Question am I asking?
Ask Yourself: What would be the perfect article title?
Insert your PICOT accordingly:
In __________(P), what is the effect of _________(I) on_____________ (O) compared with ___________(C) within______________ (T)?
Ask yourself: What are the synonyms for my P, I, C, O, T? You will want to search databases trying various synonyms so you exhaust your search.
Ask yourself: What nursing databases will I use for my research?