function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 3849],
    ['Birkhaeuser Verlag', 1539],
    ['Bulletin of the American Museum of Natural History', 1582],
    ['European Journal of Taxonomy', 2216],
    ['Flora Helvetica', 1206],
    ['Info Flora Schweiz', 1670],
    ['Journal of Natural History', 1288],
    ['Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1', 1522],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 2992],
    ['PhytoKeys', 1486],
    ['Phytotaxa', 6976],
    ['ZooKeys', 5972],
    ['Zoological Journal of the Linnean Society', 1282],
    ['Zoosystema', 1596],
    ['Zootaxa', 19070],
    ['Other (1061)', 22244]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=76490)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);