function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 4],
    ['European Journal of Taxonomy', 123],
    ['Fossil Imprint', 12],
    ['Geodiversitas', 6],
    ['Journal of Botany', 1],
    ['Journal of the Arnold Arboretum', 2],
    ['Notizblatt des Botanischen Gartens und Museums zu Berlin-Dahlem', 2],
    ['Nova Guinea. Contributions to the anthropology, botany, geology and zoology of the Papuan region. Botany', 1],
    ['Phytotaxa', 7],
    ['Zootaxa', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=160)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);