function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 12],
    ['Adansonia: Recueil d\'Observations Botaniques', 18],
    ['Biodiversity Data Journal', 22],
    ['Blumea - Biodiversity, Evolution and Biogeography of Plants', 7],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 47],
    ['Bulletin of the British Museum (Natural History), Botany Series', 11],
    ['Candollea', 35],
    ['Denkschriften der Schweizerischen Naturforschenden Gesellschaft', 51],
    ['Info Flora Schweiz', 6],
    ['J. Cramer', 9],
    ['Laurentius Salvius', 6],
    ['Order out of Chaos. Linnaean Plant Types and their Types', 11],
    ['PhytoKeys', 7],
    ['Phytotaxa', 12],
    ['Transactions of the Linnean Society of London, Second Series. Botany', 5],
    ['Other (20)', 39]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=298)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerSource', 'pie', 16, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerSource'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerSource);