function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia: Recueil d\'Observations Botaniques', 10],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 40],
    ['Bulletin of the British Museum (Natural History), Botany Series', 8],
    ['J. Cramer', 9],
    ['Journal of the Arnold Arboretum', 1],
    ['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', 2],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 1],
    ['PhytoKeys', 1],
    ['Phytotaxa', 1],
    ['Taylor & Francis', 2],
    ['Transactions of the Linnean Society of London, Second Series. Botany', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=82)',
    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);