function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aytaç, Zeki & Ertuğrul, Tuğba & Erst, Andrey & Fişne, Ahter', 2],
    ['Cabezudo, Baltasar & Solanas, Federico Casimiro-Soriguer', 1],
    ['Fiorito, Serena & Epifano, Francesco & Preziuso, Francesca', 1],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 2],
    ['Info Flora', 2],
    ['Jarvis, Charlie', 8],
    ['Juramurodov, Inom & Tojibaev, Komiljon & Nikitina, Elena', 2],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 1],
    ['Lima, Laura Cristina Pires & Queiroz, Luciano Paganucci De', 1],
    ['Liu, Pei-Liang & Guo, Qian-Xi & Zhang, Jian-Qi & Xun, Lu-Lu', 1],
    ['Nafisi, Haniyeh & Kazempour-Osaloo, Shahrokh & Kaveh, Akram', 5],
    ['Wijnands, Dirk Onno & Heniger, Johannes & Veldkamp, Jan Frederik', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=28)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);