function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Madl, M.', 4],
    ['Madl, M. & Achterberg, C. Van', 2],
    ['Madl, Michael', 1],
    ['Sharkey, Michael & Yu, Dicky & van Noort, Simon', 1],
    ['Stevens, Nicholas B. & Austin, Andrew D. & Jennings, John T.', 2],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1],
    ['van Achterberg, Cornelis & Long, Khuat Dang', 12],
    ['van Achterberg, Cornelis & Sharkey, Michael J.', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);