function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blumea - Biodiversity, Evolution and Biogeography of Plants', 2],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 3],
    ['Check List', 1],
    ['Journal of the Arnold Arboretum', 3],
    ['Kew Bulletin', 2],
    ['Linnaea: Ein Journal für die Botanik in ihrem ganzen Umfange', 1],
    ['Notizblatt des Botanischen Gartens und Museums zu Berlin-Dahlem', 4],
    ['Nova Guinea. Contributions to the anthropology, botany, geology and zoology of the Papuan region. Botany', 3],
    ['Palms Journal', 1],
    ['Phytotaxa', 9],
    ['Principes', 1],
    ['Repertorium Specierum Novarum Regni Vegetabilis', 4],
    ['Transactions of the Linnean Society of London, Second Series. Botany', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=37)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);