function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abdel-Dayem, Mahmoud S. & Fad, Hassan H. & El-Torkey, Ashraf M.', 1],
    ['Darilmaz, Mustafa C. & Kiyak, Suat', 2],
    ['Hájek, Jiří', 2],
    ['Hájek, Jiří & Reiter, Antonín', 2],
    ['Johnston, M. Andrew & Waite, Evan S. & Wright, Ethan R', 1],
    ['Perissinotto, Renzo & Bird, Matthew S. & Bilton, David T.', 1],
    ['Ramahandrison, Andriamirado Tahina & Rakouth, Bakolimalala', 1],
    ['Ribera, Ignacio & Hernando, Carles & Cieslak, Alexandra', 1],
    ['Rogers, D. Christopher & Cruz-Rivera, Edwin', 1],
    ['Suprayitno, Nano & Narakusumo, Raden Pramesa', 2],
    ['Swezey, O. H.', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    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);