The following are links to sites/ documents providing guidance on how to write/ formulate a research question using the PICO criteria:
Link to section of Cochrane HandBook:
http://tectutorials.com/Resources/AHRQ%20Modules/UoCTrainingMaterials/CochraneHB/booktext_Chap5.pdf
Links to documents (pdf):
http://library.med.nyu.edu/library/instruction/handouts/pdf/picohandout.pdf
http://www.fraserhealth.ca/media/The%20PICO%20Model.pdf
http://www.monashhealth.org/icms_docs/2145_EBP_workbook.pdf
http://library.umassmed.edu/ebpph/ebphworksheets.pdf
http://www.teachepi.org/documents/courses/sr&ma/Lecture2_Formulating%20the%20Review%20Question.pdf
http://www.phcris.org.au/phcred/research_bites/research_bites_3.pdf
http://www.atsu.edu/research/pdfs/campbell_syllabus.pdf
http://www.wombatcollaboration.net/doc/protocol%20workshop/Question%20formulation%20using%20PICO.pdf
Links to sites/ web pages:
http://learntech.physiol.ox.ac.uk/cochrane_tutorial/cochlibd0e84.php
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3140151/?report=printable
Links to articles on the PICO format:
communitymedicine4all 