function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['AL-Shehbaz, Ihsan A. & Barriera, Gabrielle', 3],
    ['Chatterjee, Tapas & Pfingstl, Tobias & Pešić, Vladimir', 2],
    ['Ermilov, Sergey G. & Tolstikov, Andrei V. & Mary, Nathalie', 1],
    ['Hugo-Coetzee K, Elizabeth A. & K, Julia Baumann', 1],
    ['Marshall, David J. & Pugh, Philip J. A.', 3],
    ['Norton, Roy A. & Ermilov, Sergey G.', 12],
    ['Pfingstl, Tobias', 5],
    ['Pfingstl, Tobias & Schuster, Reinhart', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=29)',
    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);