anchor.diff:                  "raw": [
                       {
                           "name": "United States",
  -                        "value": 38
  +                        "value": 25
                       },
                       {
                           "name": "United Kingdom",
  -                        "value": 11
  -                    },
  -                    {
  -                        "name": "Germany",
  -                        "value": 8
  +                        "value": 13
  +                    },
  +                    {
  +                        "name": "Brazil",
  +                        "value": 6
                       }
                   ]
               }
           },
           "mendeley:discipline": {
  -            "provenance_url": "http://api.mendeley.com/research/an-analytically-solvable-model-for-rapid-evolution-of-modular-structure/",
  +            "provenance_url": "http://api.mendeley.com/research/common-ecological-speciation-plant-feeding-insects-higher-nematinae-perspective/",
               "static_meta": {
                   "description": "Percent of readers by discipline, for top three disciplines (csv, api only)",
                   "display_name": "discipline, top 3 percentages",
  
positive.code:             },
              "values": {
                  "WoS": {
                      "CI95_lower": 97,
                      "CI95_upper": 100,
                      "estimate_lower": 100,
                      "estimate_upper": 100
                  },
                  "raw": 4
              }
          },
          "mendeley:readers": {
              "provenance_url": "http://api.mendeley.com/research/an-analytically-solvable-model-for-rapid-evolution-of-modular-structure/",
              "static_meta": {
                  "description": "The number of readers who have added the article to their libraries",
                  "display_name": "readers",
  
negative.code:     "version": "cristhian"
  }
  
  
  --
  add an item
  <a id="post_item"></a>
  Add an item to the ImpactStory system using the given namespace and id.  
  Returns `201` even if the item is already in the database, because this call also registers the item as sponsored under the supplied API Key (see top of this page for more information).
  
  After POSTing an item, the item data can be obtained through [GET /item](#get_item) calls.
  --
  Add an item to the ImpactStory system using the given namespace and id.  There is no data payload to the POST.
  
  This example uses a PubMed ID.  See the [GET /item](#get_item) section for more examples of valid namespaces and ids.
  POST /v1/item/pmid/20807452?key=YOURKEY
  < 201
  "ok"
  
  
  
  
  --
  get item data
  <a id="get_item"></a>
  The following is a section of resources related to research items
  
  - Returns `200` if the item metrics are available.
  - Returns `210` if the item is currently being updated.  Updating an item usually takes less than ten seconds, but can take longer depending on ImpactServer 
  server load or lag/errors from our metrics providers.  The API caller can poll slowly until a `200` is received.
  - Returns `404` if item has not yet been added to ImpactStory.  In that case, a [POST /item](#post_item) call must be made before a GET call will be successful.
  --
  **Articles with PubMed IDs** Get metrics and biblio information on the item
  will return a `210` while still updating, then a `200`
  GET /v1/item/pmid/20807452?key=YOURKEY
  < 200
  < Content-Type: application/json
  {
      "_id": "c5vh88e15ad42z9dmo1h08wi",
      "_rev": "8-6a7ece51607be9657d25cb979574e4db",
      "aliases": {
          "biblio": [
              {
                  "authors": "Nyman, Vikberg, Smith, Boev\u00e9",
                  "journal": "BMC Evolutionary Biology",
                  "repository": "Springer (Biomed Central Ltd.)",
                  "title": "How common is ecological speciation in plant-feeding insects? A 'Higher' Nematinae perspective",
                  "year": 2010
              }
          ],
          "doi": [
              "10.1186/1471-2148-10-266"
          ],
          "pmid": [
              "20807452"
          ],
          "url": [
              "http://www.biomedcentral.com/1471-2148/10/266"
          ]
      },
      "biblio": {
          "authors": "Nyman, Vikberg, Smith, Boev\u00e9",
          "genre": "article",
          "journal": "BMC Evolutionary Biology",
          "repository": "Springer (Biomed Central Ltd.)",
          "title": "How common is ecological speciation in plant-feeding insects? A 'Higher' Nematinae perspective",
          "year": 2010
      },
      "created": "2012-11-23T22:00:37.209395",
      "currently_updating": false,
      "last_modified": "2012-11-23T22:00:44.087665",
      "metrics": {
          "citeulike:bookmarks": {
              "provenance_url": "http://www.citeulike.org/doi/10.1186/1471-2148-10-266",
              "static_meta": {
                  "description": "Number of users who have bookmarked this item.",
                  "display_name": "bookmarks",
  