exportPattern("^[[:alpha:]]+")
S3method(print,CopyNumber450kCancer_data)
  importFrom("grDevices", "dev.off", "graphics.off", "png")
  importFrom("graphics", "abline", "axis", "box", "layout", "legend",
             "locator", "mtext", "par", "plot", "rect", "text")
  importFrom("methods", "hasArg")
  importFrom("stats", "IQR", "density", "median", "sd")
  importFrom("utils", "read.csv", "write.csv")