function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alessandri, G. De', 3],
    ['Chan, Benny K. K. & Dreyer, Niklas & Gale, Andy S.', 3],
    ['Gruvel, A.', 1],
    ['Harzhauser, Mathias & Newman, William A. & Grunert, Patrick', 2],
    ['Henry, D. P.', 1],
    ['Korschelt, Eugen', 1],
    ['Pilsbry, Henry A.', 2],
    ['Ross, Arnold & Frick, Michael G.', 3],
    ['Rothpletz, (Friedrich) August & Simonelli, V.', 1],
    ['Seguenza, G.', 1],
    ['Shahdadi, Adnan & Sari, Alireza & Naderloo, Reza', 3],
    ['Trivedi, Jigneshkumar N. & Doshi, Mahima & Patel, Krupal J.', 1],
    ['Zullo, V. A.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);