Other Bibliography Search Engines

National Library of Medicine's literature search site
comprises more than 19 million citations for biomedical literature from MEDLINE, life science journals, and online books.
Quality of Life Instruments Database
contains a list of over 1000 PRO instruments and is structured in two levels of access:
  • a first level accessible to all users free of charge and which contains for over 300 instruments the following information: full abbreviated name of the questionaire, author(s), objective, pathology, disease, type of instrument, population, mode of administration, original language and list of translations.
  • a second level is based on yearly subscriptions