Medical staff on cruise ships are there for emergency care of guests as well as to support the needs of the crew. Think of them as an immediate care clinic, not usually staffed by a chiropractor. Or bring Dr. G along with you.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015