function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 4],
    ['Bijdragen tot de Flora van Nederlandsch Indie', 1],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 1],
    ['European Journal of Taxonomy', 1],
    ['Laurentius Salvius', 17],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 56],
    ['Rev. Inst. Nac. Invest. Ciencias Nat. " Bernardino Riggi. "', 1],
    ['The London Journal of Botany; Containing Figures and Descriptions of Such Plants as Recommend Themselves by Their Novelty, Rarit', 1],
    ['Zoosystema', 1],
    ['Zootaxa', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=86)',
    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);