function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 53],
    ['Biodiversity Data Journal', 117],
    ['Birkhaeuser Verlag', 268],
    ['Candollea', 97],
    ['Denkschriften der Schweizerischen Naturforschenden Gesellschaft', 177],
    ['Flora Helvetica', 261],
    ['Flora Nordica', 66],
    ['Info Flora Schweiz', 331],
    ['Laurentius Salvius', 350],
    ['Linzer biologische Beiträge', 48],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 577],
    ['PhytoKeys', 420],
    ['Phytotaxa', 821],
    ['Systematic Botany', 57],
    ['The Families and Genera of Vascular Plants 2', 115],
    ['Other (62)', 375]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=4133)',
    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);