function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Brooks, Scott E. & Cumming, Jeffrey M.', 7],
    ['Brooks, Scott E. & Ulrich, Hans', 2],
    ['Bächli, Gerhard & Merz, Bernhard & Haenni, Jean-Paul', 1],
    ['Cumming, Jeffrey M. & Brooks, Scott E.', 5],
    ['Gatt, Paul', 3],
    ['Grichanov, I. Ya. & Selivanova, O. O.', 1],
    ['Kahanpaeae, Jere', 2],
    ['Shamshev, Igor V. & Grootaert, Patrick', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    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);