medical books and often consult- the use of 'and' here is a bit dodgy for me as you have used 'prefer' in the first- how about 'but/but also?
not only by small number of studies- I'd say the small number
only population- population only
literatures review- I'd use literature
only base on the family physicians, the result - only based on family physicians; the results
study done- were done
Student or Learner