Maintainer: ‘Yifan (Ethan) Xu <ethan.yifanxu@gmail.com>’

Package CITATION file contains call(s) to old-style personList() or
as.personList().  Please use c() on person objects instead.
Package CITATION file contains call(s) to old-style citEntry().  Please
use bibentry() instead.

The Description field contains
  http://smm.sagepub.com/content/early/2015/10/15/0962280215609948.abstract.
Please enclose URLs in angle brackets (<...>).
Maintainer: ‘Yifan (Ethan) Xu <ethan.yifanxu@gmail.com>’

Package CITATION file contains call(s) to old-style personList() or
as.personList().  Please use c() on person objects instead.
Package CITATION file contains call(s) to old-style citEntry().  Please
use bibentry() instead.

The Description field contains
  http://smm.sagepub.com/content/early/2015/10/15/0962280215609948.abstract.
Please enclose URLs in angle brackets (<...>).
Namespaces in Imports field not imported from:
  ‘fields’ ‘knitr’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘fields’ ‘knitr’
  All declared Imports should be used.