function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 6],
    ['American Museum Novitates', 1],
    ['Birkhaeuser Verlag', 2],
    ['Flora Helvetica', 2],
    ['Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos', 1],
    ['Info Flora Schweiz', 4],
    ['Mammal Species of the World (1 st Edition)', 2],
    ['Mammal Species of the World (2 nd Edition)', 2],
    ['Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1', 2],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 4],
    ['Phytotaxa', 3],
    ['Proceedings of the Zoological Society of London', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=30)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);