function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Biodiversity Data Journal', 28],
    ['Bollettino del Laboratorio di zoologia generale e agraria della R. Scuola superiore d\'agricoltura in Portici', 2],
    ['Journal of the Washington Academy of Sciences', 1],
    ['Linzer biologische Beiträge', 6],
    ['Proceedings of the Hawaiian Entomological Society', 2],
    ['Proceedings of the United States National Museum, 3', 1],
    ['ZooKeys', 2],
    ['Zootaxa', 32]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=74)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);