function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 1],
    ['Allertonia', 1],
    ['Beiblatt zu den Botanischen Jahrbuchern', 1],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 20],
    ['Brittonia', 6],
    ['Candollea', 7],
    ['Icones Bogorienses', 1],
    ['Journal of Botany, British and Foreign, London', 4],
    ['Journal of the Arnold Arboretum', 4],
    ['Notizblatt des Botanischen Gartens und Museums zu Berlin-Dahlem', 1],
    ['Nova Guinea. Contributions to the anthropology, botany, geology and zoology of the Papuan region. Botany', 1],
    ['Phytotaxa', 12],
    ['Proceedings of the Royal Society of Queensland', 1],
    ['Transactions of the Linnean Society of London, Second Series. Botany', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=65)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);