function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balzan, L.', 1],
    ['Banks, Nathan', 1],
    ['Beier, Max', 19],
    ['Di Caporiacco, L.', 5],
    ['Hadži, Jovan', 4],
    ['Koch, Ludwig Carl Christian', 3],
    ['Morikawa, Kinichi', 1],
    ['Novák, János', 2],
    ['Rafalski, Jan', 1],
    ['Redikorzev, V.', 1],
    ['Tömösváry, Ö.', 1],
    ['Vachon, Max', 1],
    ['Zaragoza, Juan & Henderickx, Hans', 2],
    ['Zaragoza, Juan A. & Áhlavský, Franti Š Ek Š Ť', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=44)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);