function drawChartTreatmentsPerSource() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Adansonia', 6],
    ['Annales du Jardin Botanique de Buitenzorg.', 1],
    ['Biodiversity Data Journal', 1],
    ['Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie.', 21],
    ['Exc. L. M. Ho ̊ jer', 1],
    ['Journal of the Arnold Arboretum', 11],
    ['Laurentius Salvius', 1],
    ['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', 5],
    ['PhytoKeys', 31],
    ['Phytotaxa', 11],
    ['Reinwardtia', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Journal (n=93)',
    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);