function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 10],
    ['Annales du Jardin Botanique de Buitenzorg.', 1],
    ['Biodiversity Data Journal', 3],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 1],
    ['Bulletin du Départment de L\'Agriculture aux Indes Néerlandaises', 2],
    ['European Journal of Taxonomy', 2],
    ['Journal of Natural History', 2],
    ['Laurentius Salvius', 1],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 3],
    ['PhytoKeys', 1],
    ['Phytotaxa', 31],
    ['Zoological Journal of the Linnean Society', 1],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=60)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);