Shingles

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/239892/2013181_Shingles_QA_for_healthcare_professionals_final.pdf

http://www.nhs.uk/Conditions/Shingles/Pages/causes.aspx

http://www.nhs.uk/Conditions/vaccinations/Pages/shingles-vaccine-questions-and-answers.aspx

https://www.gov.uk/government/news/phe-welcomes-changes-to-the-uk-vaccination-programme

http://www.medicines.org.uk/emc/medicine/25927

http://www.immunisationscotland.org.uk/vaccines-and-diseases/shingles.aspx

https://www.gov.uk/government/publications/shingles-vaccination-training-slideset-for-healthcare-professionals

http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD008858.pub2/abstract;jsessionid=3EF93E51CA456D8329387F2C82B3ED40.d01t01

Caffeinated alcohol

http://cot.food.gov.uk/pdfs/cotlaystatementcaffalco201204.pdf

http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm350570.htm

http://www.fda.gov/NewsEvents/PublicHealthFocus/ucm234900.htm

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3038341/

http://www.bmj.com/content/347/bmj.f5345