@article{34a2bbc09a534cfc8df7ac60219ed477,
  title   = "Trials must enrol people with multiple problems",
  author  = "Witham, {Miles D.}",
  year    = "2012",
  volume  = "344",
  pages   = "--",
  journal = "BMJ",
  issn    = "0959-535X",
}