function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Haľkova, Beata & Drabova, Martina & Mock, Andrej', 3],
    ['Keller, Oliver & Dunn, Ann & Soto-Adames, Felipe', 1],
    ['Mikhaljova, Elena V.', 1],
    ['Mikhaljova, Elena V. & Lim, Kil-Young', 2],
    ['Shelley, Rowland M. & Shear, William A.', 2],
    ['Snyder, Bruce A.', 3],
    ['Wesener, Thomas', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);