function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 2],
    ['Blumea - Biodiversity, Evolution and Biogeography of Plants', 9],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 4],
    ['Bulletin de la Société Botanique de France', 1],
    ['Bulletin du Départment de L\'Agriculture aux Indes Néerlandaises', 3],
    ['Geodiversitas', 1],
    ['Insecta Mundi', 1],
    ['Journal of Natural History', 2],
    ['Journal of the Arnold Arboretum', 5],
    ['PhytoKeys', 5],
    ['Phytotaxa', 2],
    ['Zoosystema', 1],
    ['Zootaxa', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=37)',
    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);