function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Habib, Kamran & Firdous, Qudsia & Sohrabi, Mohammad', 1],
    ['Iqbal, Muhammad Shahid & Usman, Muhammad & Habib, Kamran', 2],
    ['Jarvis, Charlie', 4],
    ['Marcano, Vicente', 2],
    ['McMullin, Richard Troy & Simon, Andrew D. F. & Brodo, Irwin M.', 10],
    ['Oset, Magdalena', 3],
    ['R, Jeanne dos & Silva, eis & Aptroot, André & E, Marcela', 8],
    ['Ramírez-Roncallo, Kevin & Gómez-Ramírez, Hugo', 1],
    ['Schmitt, Imke & Otte, Juergen & Parnmen, Sittiporn', 8],
    ['Szczepańska, Katarzyna & Kukwa, Martin & Guzow-Krzemińska, Beata', 6],
    ['Usman, Muhammad & Dyer, Paul S. & Brock, Matthias', 2],
    ['Wijayawardene, Nalin N. & Dai, Dong-Qin & Premarathne, Bhagya M.', 1],
    ['Zulfiqar, Rizwana & Asghar, Hafiza Simab & Khalid, Abdul Nasir', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=51)',
    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);